Batch download of network images and Java Network Images Based on java

Batch download of network images and Java Network Images Based on java

Yesterday, my friend encountered a requirement for a project. He needed to download thousands of Weibo emoticon images to a local disk and name them properly. Then, he gave me a bunch of Json data and asked me to handle it, no matter whether you are idle or not, you can help write it. (This is a simple function. It just fills in the blank of the recent blog)

Because it is just a convenient tool, you don't need any graphical interface. You can use Java to write it first ~

1 package com. lcw. downloadutil. domain; 2 3 public class Bean {4 5 private String phrase; 6 private String type; 7 private String url; 8 private Boolean hot; 9 private Boolean common; 10 private String category; 11 private String icon; 12 private String value; 13 private String picid; 14 15 public String getPhrase () {16 return phrase; 17} 18 19 public void setPhrase (String phrase) {20 this. phrase = phrase; 21} 22 23 public String getType () {24 return type; 25} 26 27 public void setType (String type) {28 this. type = type; 29} 30 31 public String getUrl () {32 return url; 33} 34 35 public void setUrl (String url) {36 this. url = url; 37} 38 39 public Boolean getHot () {40 return hot; 41} 42 43 public void setHot (Boolean hot) {44 this. hot = hot; 45} 46 47 public Boolean getCommon () {48 return common; 49} 50 51 public void setCommon (Boolean common) {52 this. common = common; 53} 54 55 public String getCategory () {56 return category; 57} 58 59 public void setCategory (String category) {60 this. category = category; 61} 62 63 public String getIcon () {64 return icon; 65} 66 67 public void setIcon (String icon) {68 this. icon = icon; 69} 70 71 public String getValue () {72 return value; 73} 74 75 public void setValue (String value) {76 this. value = value; 77} 78 79 public String getPicid () {80 return picid; 81} 82 83 public void setPicid (String picid) {84 this. picid = picid; 85} 86 87 @ Override88 public String toString () {89 return "Bean [phrase =" + phrase + ", type =" + type + ", url = "+ url +", hot = "+ hot +", common = "+ common +", category = "+ category +", icon = "+ icon + ", value = "+ value +", picid = "+ picid +"] "; 90} 91 92}

Some methods are encapsulated for processing (network data acquisition, Json data deserialization, and image resource download)

1 package com. lcw. downloadutil. utils; 2 3 import java. io. bufferedInputStream; 4 import java. io. bufferedOutputStream; 5 import java. io. bufferedReader; 6 import java. io. file; 7 import java. io. fileOutputStream; 8 import java. io. IOException; 9 import java. io. inputStream; 10 import java. io. inputStreamReader; 11 import java.net. malformedURLException; 12 import java.net. URL; 13 import java. util. list; 14 1 5 import com. google. gson. gson; 16 import com. google. gson. reflect. typeToken; 17 import com. lcw. downloadutil. domain. bean; 18 19/** 20 * tool class set 21*22 * @ author Rabbit_Lee 23*24 */25 public class HelpUtils {26/** 27 * Get Json according to the provided url data 28*29 * @ param path 30 * @ return 31 */32 public String getHttpString (String path) {33 // store the obtained data 34 String info = ""; 35 // The variable 36 InputStream in = n for the network request Ull; 37 InputStreamReader reader = null; 38 BufferedReader bufferedReader = null; 39 try {40 URL url = new URL (path); 41 // open the address based on the Url, returns the input stream 42 in = url in UTF-8 encoding format. openStream (); 43 reader = new InputStreamReader (in, "UTF-8"); 44 bufferedReader = new BufferedReader (reader); 45 // tentatively accept the data variable 46 String temp = null; 47 while (temp = bufferedReader. readLine ())! = Null) {48 info + = temp; 49} 50 return info; 51} catch (MalformedURLException e) {52 e. printStackTrace (); 53} catch (IOException e) {54 e. printStackTrace (); 55} finally {56 try {57 in. close (); 58 reader. close (); 59 bufferedReader. close (); 60} catch (IOException e) {61 e. printStackTrace (); 62} 63} 64 return null; 65} 66 67/** 68 * deserialize the provided Json data into a Java object (List set) 69*70 * @ param json 71 * @ return 72 */73 public List <Bean> changeJsonToList (String json) {74 // deserialize JSON data into a JAVA object using Gson 75 Gson gson = new Gson (); 76 List <Bean> beans = gson. fromJson (json, new TypeToken <List <Bean> () {77 }. getType (); 78 return beans; 79} 80 81/** 82 * download image, and store 83 * @ param bean 84 * @ param filePath 85 */86 public void makeImage (Bean bean, String filePath) according to the specified path) {87 // variable 88 try {89 for network requests // Obtain the input stream 90 BufferedInputStream in = new BufferedInputStream (new URL (bean. getUrl ()). openStream (); 91 // create a File stream 92 file File = new File (filePath + bean. getPhrase () + ". gif "); 93 BufferedOutputStream out = new BufferedOutputStream (new FileOutputStream (file); 94 // buffer byte array 95 byte [] data = new byte [2048]; 96 int length = in. read (data); 97 while (length! =-1) {98 out. write (data, 0, data. length); 99 length = in. read (data); 100} 101 System. out. println ("executing download task: currently downloading image" + bean. getPhrase () + ". gif "); 102 in. close (); 103 out. close (); 104} catch (MalformedURLException e) {105 e. printStackTrace (); 106} catch (IOException e) {107 e. printStackTrace (); 108} 109} 110 111}

The above code processes Json data. I used the Gson tool class that Google provided to us.

For Gson class do not understand the use of friends can read I have written before an article: Gson brief use notes: http://www.cnblogs.com/lichenwei/p/3987429.html

Next, the main class is called:

1 package com. lcw. downloadutil. main; 2 3 import java. util. list; 4 5 import com. lcw. downloadutil. domain. bean; 6 import com. lcw. downloadutil. utils. helpUtils; 7 8 public class TaskMain {9 10 private static final String URL = "some private data related to Oauth2.0 is not provided here"; 11 private static String mJsonInfo; 12 13 public static void main (String [] args) {14 HelpUtils helpUtils = new HelpUtils (); 15 // get Json data 16 mJsonInfo = helpUtils. getHttpString (URL); 17 // deserializes Json data into java object 18 List <Bean> beans = helpUtils. changeJsonToList (mJsonInfo); 19 // loop traversal download image 20 for (int I = 0; I <beans. size (); I ++) {21 helpUtils. makeImage (beans. get (I), "C:/images/"); 22} 23 24} 25 26}

 

This is the end of the process. If you have any questions, you can comment on the article.

Author: Balla _ rabbit
Source: http://www.cnblogs.com/lichenwei/
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