CN106156235A - A kind of picture method for down loading based on Android platform and system - Google Patents
A kind of picture method for down loading based on Android platform and system Download PDFInfo
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- CN106156235A CN106156235A CN201510204181.4A CN201510204181A CN106156235A CN 106156235 A CN106156235 A CN 106156235A CN 201510204181 A CN201510204181 A CN 201510204181A CN 106156235 A CN106156235 A CN 106156235A
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Abstract
The invention discloses a kind of picture method for down loading based on Android platform and system, by obtaining a MD5 value of picture to be downloaded at server end, and a described MD5 value is added in the download address of picture to be downloaded；Intelligent terminal downloads described picture from described server end, obtains a MD5 value of correspondence according to described download address；Intelligent terminal obtains the 2nd MD5 value that the described picture downloaded is corresponding；A described MD5 value is contrasted with the 2nd MD5 value, if unanimously, then shows described picture；The MD5 value of the picture MD5 value of server end picture downloaded with intelligent terminal is compared; if it is consistent; then explanation picture is downloaded correct and complete; if it is inconsistent; then explanation picture is downloaded incorrect or imperfect; improve the correctness in picture downloading process and protect the integrity of picture, improve protection, bring to user and greatly facilitate.
Description
Technical field
The present invention relates to intelligent terminal's technical field of android system, a kind of picture method for down loading based on Android platform and system.
Background technology
Along with the development of intelligent terminal's technology, the use of the intelligent terminal such as TV, mobile phone, panel computer is more and more universal.These intelligent terminal much have employed android system, and Android platform provides an Image Loader(picture Asynchronous loading the class cached on download pictures) Open Framework.This framework functions very powerful, support the local and download of network picture and display, memory management during especially picture being downloaded and shown provides good solution, also provides some and sets a property, for developer's solution special demand.But for network download pictures, the picture downloaded is the most correctly or the most completely highly important problem, particularly show after being downloaded by this framework when some important pictures, it is more likely that revised by other persons who is ambitious or tenacious of purpose, bring loss to user.Correctness and the integrity of existing Android platform download pictures can not be verified, and correctness and integrity cannot be protected.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is, it is provided that a kind of picture method for down loading based on Android platform and system, it is intended to the correctness and the integrity that solve the picture download display of existing android system intelligent terminal are the highest, the problem that protection is low.
It is as follows that the present invention solves the technical scheme that technical problem used:
A kind of picture method for down loading based on Android platform, wherein, comprises the following steps:
S100, obtain a MD5 value of picture to be downloaded at server end, and a described MD5 value is added in the download address of picture to be downloaded；
S200, intelligent terminal download described picture from described server end, obtain a MD5 value of correspondence according to described download address；
S300, intelligent terminal obtain the 2nd MD5 value that the described picture downloaded is corresponding；
S400, a described MD5 value is contrasted with the 2nd MD5 value, if unanimously, then show described picture.
Described picture method for down loading based on Android platform, wherein, described step S100 specifically includes:
S110, server end are treated download pictures and are processed, and obtain the MD5 value that described picture is corresponding；
S120, a described MD5 value is added in the download address of described picture.
Described picture method for down loading based on Android platform, wherein, described step S200 specifically includes:
S210, intelligent terminal download described picture from described server end；
S220, intelligent terminal, according to the download address of described picture, obtain a MD5 value of correspondence.
Described picture method for down loading based on Android platform, wherein, described step S300 also includes:
S310, intelligent terminal download described picture from described server end, and preserve to local cache；
S320, obtain the 3rd MD5 value that picture described in described local cache is corresponding, it is judged that described 3rd MD5 value is the most consistent with a MD5 value, if inconsistent, then delete picture described in local cache.
Described picture method for down loading based on Android platform, wherein, also includes between described step S100 and S200:
Whether S190, detection intelligent terminal open MD5 verification, if opening, then perform step S200；If being not turned on, then intelligent terminal downloads described picture and shows.
A kind of picture download system based on Android platform, wherein, including:
First picture processing module, for obtaining a MD5 value of picture to be downloaded at server end, and adds to a described MD5 value in the download address of picture to be downloaded；
Download module, for downloading described picture by intelligent terminal from described server end, obtains a MD5 value of correspondence according to described download address；
Second picture processing module, for obtaining the 2nd MD5 value that the described picture downloaded is corresponding by intelligent terminal；
Contrast module, for a described MD5 value being contrasted with the 2nd MD5 value, if unanimously, then shows described picture.
Described picture download system based on Android platform, wherein, described first picture processing module includes:
Oneth MD5 value acquiring unit, processes for treating download pictures by server end, obtains the MD5 value that described picture is corresponding；
Address adding device, in the download address that a described MD5 value is added to described picture.
Described picture download system based on Android platform, wherein, described download module includes:
Picture download unit, for downloading described picture by intelligent terminal from described server end；
Address acquisition unit, is used for by intelligent terminal according to the download address of described picture, obtains a MD5 value of correspondence.
Described picture download system based on Android platform, wherein, described second picture processing module includes:
Buffer unit, for downloading described picture by intelligent terminal from described server end, and preserves to local cache；
Identifying unit, for obtaining the 3rd MD5 value that picture described in described local cache is corresponding, it is judged that described 3rd MD5 value is the most consistent with a MD5 value, if inconsistent, then deletes picture described in local cache.
Described picture download system based on Android platform, wherein, also includes:
Verification detection module, being used for detecting whether intelligent terminal opens MD5 verification, if opening, then triggering described download module；If being not turned on, then intelligent terminal downloads described picture and shows.
A kind of picture method for down loading based on Android platform provided by the present invention and system; the correctness and the integrity that efficiently solve the picture download display of existing android system intelligent terminal are the highest; the problem that protection is low; by obtaining a MD5 value of picture to be downloaded at server end, and a described MD5 value is added in the download address of picture to be downloaded；Intelligent terminal downloads described picture from described server end, obtains a MD5 value of correspondence according to described download address；Intelligent terminal obtains the 2nd MD5 value that the described picture downloaded is corresponding；A described MD5 value is contrasted with the 2nd MD5 value, if unanimously, then shows described picture；The MD5 value of the picture MD5 value of server end picture downloaded with intelligent terminal is compared; if it is consistent; then explanation picture is downloaded correct and complete; if it is inconsistent; then explanation picture is downloaded incorrect or imperfect; be conducive to picture correctness and the protection of integrity in downloading process, improve protection, bring to user and greatly facilitate.
Accompanying drawing explanation
The flow chart of the picture method for down loading preferred embodiment based on Android platform that Fig. 1 provides for the present invention.
The structured flowchart of the picture download system preferred embodiment based on Android platform that Fig. 2 provides for the present invention.
Detailed description of the invention
The present invention provides a kind of picture method for down loading based on Android platform and system, and for making the purpose of the present invention, technical scheme and advantage clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to the flow chart of the picture method for down loading preferred embodiment based on Android platform that Fig. 1, Fig. 1 provide for the present invention, as it can be seen, said method comprising the steps of:
Step S100, obtain a MD5 value of picture to be downloaded at server end, and a described MD5 value is added in the download address of picture to be downloaded；
Step S200, intelligent terminal download described picture from described server end, obtain a MD5 value of correspondence according to described download address；
Step S300, intelligent terminal obtain the 2nd MD5 value that the described picture downloaded is corresponding；
Step S400, a described MD5 value is contrasted with the 2nd MD5 value, if unanimously, then show described picture.
Below in conjunction with specific embodiment, above-mentioned steps is described in detail.
In the step s 100, obtain a MD5 value of picture to be downloaded at server end, and a described MD5 value is added in the download address of picture to be downloaded.Specifically, it is simply that at server end, picture to be downloaded is processed, the MD5 value of this picture is obtained.MD5 i.e. Message Digest
Algorithm MD5(Message-Digest Algorithm 5); for guaranteeing that information transmission is complete consistent; it is one of widely used hash algorithm of computer (translating again digest algorithm, hash algorithm), for the widely used a kind of hash function of computer safety field, in order to provide the integrity protection of message.Each picture has unique corresponding MD5 value.User can obtain the MD5 value of picture by calibration tool.
When reality is applied, first server end is treated download pictures and is processed, and obtains the MD5 value that described picture is corresponding.In order to the convenient transmission of MD5 value is to intelligent terminal, a described MD5 value is also added in the download address of described picture by server end.At server end, picture download address is processed, the MD5 value of download pictures is added to and represents with this format inside the download address of picture: http://xxx.xx.xx/pic/xxx.jpg?Md5=479rf4fc78203646xxxx, so just can obtain, as this url (Uniform Resource Locator, URL), the MD5 value that this picture is correct terminal uses when from url address.URL is a kind of succinct expression of the position to the resource that can obtain from the Internet and access method, is the address of standard resource on the Internet.
In step s 200, intelligent terminal downloads described picture from described server end, obtains a MD5 value of correspondence according to described download address.Specifically, described intelligent terminal is the intelligent terminal of application android system, such as intelligent television, mobile terminal (mobile phone, panel computer) etc..Intelligent terminal downloads described picture and a MD5 value by modes such as the Internets from described server end.
When reality is applied, intelligent terminal can download described picture from described server end, then according to the download address of described picture, obtains a MD5 value of correspondence.
In described step S300, intelligent terminal obtains the 2nd MD5 value that the described picture downloaded is corresponding.Specifically, it is simply that intelligent terminal's picture to having downloaded carries out the verification of MD5 value, by corresponding calibration tool, just can obtain the MD5 value that downloaded picture is corresponding, the 2nd the most above-mentioned MD5 value.
In step S400, a described MD5 value is contrasted with the 2nd MD5 value, if unanimously, then show described picture.Specifically, intelligent terminal has downloaded a MD5 value from server end, and this MD5 value is that server end deposits check value corresponding during picture, and the check value that the 2nd MD5 value is corresponding after to be intelligent terminal downloaded this picture.It is to say, a MD5 value is the check value that picture is corresponding when server end, the 2nd MD5 value is the check value that picture is corresponding when intelligent terminal.Both are contrasted by intelligent terminal, if unanimously, then illustrate that described picture does not change in downloading process, then show described picture；If inconsistent, then illustrate that described picture there occurs change in downloading process, the most do not show described picture.
Further, also include between described step S100 and S200:
Whether S190, detection intelligent terminal open MD5 verification, if opening, then perform step S200；If being not turned on, then intelligent terminal downloads described picture and shows.Specifically, it is simply that whether intelligent terminal user can be arranged on intelligent terminal opens the MD5 verification that picture is downloaded, if opening, the above-mentioned flow process then performing the present invention carries out picture download verification, if being not turned on, then download according to conventional download step and show picture, not verifying.
Further, owing to the Image Loader Open Framework of this android system has caching function, the picture of download needs to be cached to local portion, and described step S300 also includes:
S310, intelligent terminal download described picture from described server end, and preserve to local cache；
S320, obtain the 3rd MD5 value that picture described in described local cache is corresponding, it is judged that described 3rd MD5 value is the most consistent with a MD5 value, if inconsistent, then delete picture described in local cache.Specifically, it is simply that processing the picture in caching, obtain its 3rd MD5 value, the MD5 value then transmitted with server end contrasts, just delete the picture in caching if inconsistent, if unanimously, do not delete.
With a specific embodiment, the present invention is described in detail below.In the intelligent terminal of android system, DisplayImageOptions class is found inside android-universal-Image-Loader framework source code, such is mainly the interface that Developmental Engineer provides an attribute to arrange, and the present invention is adding this apoplexy due to endogenous wind to the need of the attribute arranging picture md5 verification.Add a parameter: private final boolean isMd5；
With two methods: public boolean shouldMd5 ()
return isMd5;}
public Builder setNoMd5(){
isMd5 = false;
returnthis;
}
Two methods are all to add to ensure that the concordance adding interface and this class interface on the basis of primary DisplayImageOptions class.
Then inside android-universal Image Loader framework source code, BaseImageDecoder class is found, such effect is used to generate the bitmap(bitmap file that download pictures shows), inside this class, find decode method, the when of generating bitmap inside the method, add MD5 verification.Add md5 method of calibration check Md5 (url, inputstream), wherein url is exactly the address of download pictures, inputstream is the output stream of download pictures, the method mainly realizes obtaining the md5 value of picture inside url and being obtained the md5 of picture by imputstream, comparing after acquisition, if being equally returned to the bitmap generated, otherwise returning sky.
When the md5 value of picture of intelligent terminal's local cache and url pass over inconsistent time, need to delete the picture that caching is following.It is thus desirable to add the operation deleting caching picture inside check Md5 method.So, just achieve original Image
The amendment of Loader framework.
When using this Image Loader framework when, first can call above-mentioned setNoMd5(DisplayImageOptions attribute is set when) interface, never call expression acquiescence picture to be carried out md5 verification.
Further, by original android-universal Image Loader framework readjustment display interface, flow processing is done returning bitmap display part, when return value then points out user equal to time empty, such as picture is wrong, picture download is incorrect, picture download is abnormal, reaches more preferable Consumer's Experience effect, makes the very clear picture of user download abnormal, inaccurate, downloading process occur abnormal.
The picture method for down loading based on Android platform that the present invention provides, to android-universal
The attribute setup module of Image Loader framework is extended; with the addition of and whether carry out picture MD5 value verification attribute; then generate at picture bitmap and carry out the checking of MD5 value with the locally-downloaded part of picture; the MD5 value that MD5 value according to download pictures and server pass over compares; if consistent, show the picture of download, inconsistent, do not show; thus improve the correctness in picture downloading process and protect the integrity of picture, ensure correctness and the integrity of download pictures.
Picture method for down loading based on above-mentioned Android platform, present invention also offers a kind of picture download system based on Android platform, as in figure 2 it is shown, include:
First picture processing module 10, for obtaining a MD5 value of picture to be downloaded at server end, and adds to a described MD5 value in the download address of picture to be downloaded；Specifically as described in step S100；
Download module 20, for downloading described picture by intelligent terminal from described server end, obtains a MD5 value of correspondence according to described download address；Specifically as described in step S200；
Second picture processing module 30, for obtaining the 2nd MD5 value that the described picture downloaded is corresponding by intelligent terminal；Specifically as described in step S300；
Contrast module 40, for a described MD5 value being contrasted with the 2nd MD5 value, if unanimously, then shows described picture；Specifically as described in step S400.
Further, described first picture processing module 10 includes:
Oneth MD5 value acquiring unit, processes for treating download pictures by server end, obtains the MD5 value that described picture is corresponding；
Address adding device, in the download address that a described MD5 value is added to described picture.
Further, described download module 20 includes:
Picture download unit, for downloading described picture by intelligent terminal from described server end；
Address acquisition unit, is used for by intelligent terminal according to the download address of described picture, obtains a MD5 value of correspondence.
Further, described second picture processing module 30 includes:
Buffer unit, for downloading described picture by intelligent terminal from described server end, and preserves to local cache；
Identifying unit, for obtaining the 3rd MD5 value that picture described in described local cache is corresponding, it is judged that described 3rd MD5 value is the most consistent with a MD5 value, if inconsistent, then deletes picture described in local cache.
Further, picture download system based on Android platform, also include:
Verification detection module, being used for detecting whether intelligent terminal opens MD5 verification, if opening, then triggering described download module；If being not turned on, then intelligent terminal downloads described picture and shows.
Described intelligent terminal is the terminal that mobile phone, panel computer, intelligent television etc. have Android platform.
In sum, a kind of based on Android platform the picture method for down loading of present invention offer and system, by obtaining a MD5 value of picture to be downloaded at server end, and a described MD5 value is added in the download address of picture to be downloaded；Intelligent terminal downloads described picture from described server end, obtains a MD5 value of correspondence according to described download address；Intelligent terminal obtains the 2nd MD5 value that the described picture downloaded is corresponding；A described MD5 value is contrasted with the 2nd MD5 value, if unanimously, then shows described picture；The MD5 value of the picture MD5 value of server end picture downloaded with intelligent terminal is compared; if it is consistent; then explanation picture is downloaded correct and complete; if it is inconsistent; then explanation picture is downloaded incorrect or imperfect; improve the correctness in picture downloading process and protect the integrity of picture, improve protection, bring to user and greatly facilitate.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (10)
1. a picture method for down loading based on Android platform, it is characterised in that comprise the following steps:
A, obtain a MD5 value of picture to be downloaded at server end, and a described MD5 value is added in the download address of picture to be downloaded；
B, intelligent terminal download described picture from described server end, obtain a MD5 value of correspondence according to described download address；
C, intelligent terminal obtain the 2nd MD5 value that the described picture downloaded is corresponding；
D, a described MD5 value is contrasted with the 2nd MD5 value, if unanimously, then show described picture.
Picture method for down loading based on Android platform the most according to claim 1, it is characterised in that described step A specifically includes:
A1, server end are treated download pictures and are processed, and obtain the MD5 value that described picture is corresponding；
A2, a described MD5 value is added in the download address of described picture.
Picture method for down loading based on Android platform the most according to claim 2, it is characterised in that described step B specifically includes:
B1, intelligent terminal download described picture from described server end；
B2, intelligent terminal, according to the download address of described picture, obtain a MD5 value of correspondence.
Picture method for down loading based on Android platform the most according to claim 1, it is characterised in that described step C also includes:
C1, intelligent terminal download described picture from described server end, and preserve to local cache；
C2, obtain the 3rd MD5 value that picture described in described local cache is corresponding, it is judged that described 3rd MD5 value is the most consistent with a MD5 value, if inconsistent, then delete picture described in local cache.
Picture method for down loading based on Android platform the most according to claim 1, it is characterised in that also include between described step A and B:
Whether B0, detection intelligent terminal open MD5 verification, if opening, then perform step B；If being not turned on, then intelligent terminal downloads described picture and shows.
6. a picture download system based on Android platform, it is characterised in that including:
First picture processing module, for obtaining a MD5 value of picture to be downloaded at server end, and adds to a described MD5 value in the download address of picture to be downloaded；
Download module, for downloading described picture by intelligent terminal from described server end, obtains a MD5 value of correspondence according to described download address；
Second picture processing module, for obtaining the 2nd MD5 value that the described picture downloaded is corresponding by intelligent terminal；
Contrast module, for a described MD5 value being contrasted with the 2nd MD5 value, if unanimously, then shows described picture.
Picture download system based on Android platform the most according to claim 6, it is characterised in that described first picture processing module includes:
Oneth MD5 value acquiring unit, processes for treating download pictures by server end, obtains the MD5 value that described picture is corresponding；
Address adding device, in the download address that a described MD5 value is added to described picture.
Picture download system based on Android platform the most according to claim 7, it is characterised in that described download module includes:
Picture download unit, for downloading described picture by intelligent terminal from described server end；
Address acquisition unit, is used for by intelligent terminal according to the download address of described picture, obtains a MD5 value of correspondence.
Picture download system based on Android platform the most according to claim 6, it is characterised in that described second picture processing module includes:
Buffer unit, for downloading described picture by intelligent terminal from described server end, and preserves to local cache；
Identifying unit, for obtaining the 3rd MD5 value that picture described in described local cache is corresponding, it is judged that described 3rd MD5 value is the most consistent with a MD5 value, if inconsistent, then deletes picture described in local cache.
Picture download system based on Android platform the most according to claim 6, it is characterised in that also include:
Verification detection module, being used for detecting whether intelligent terminal opens MD5 verification, if opening, then triggering described download module；If being not turned on, then intelligent terminal downloads described picture and shows.
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