使用HTTP GET請求下載Zip文件的提取內容

Question

我必須從其餘的調用並提取其內容（某些PDF文件和PNG文件）下載Zip文件。

我正在使用Java Spring。

怎麼辦？

Answer 1

你可以使用Spring的RestTemplate下載文件

RestTemplate templ = new RestTemplate(); 
byte[] downloadedBytes = templ.getForObject(url, byte[].class); 

用標準java或第三方庫提取內容。

實施例實用，適於從這裏：http://www.codejava.net/java-se/file-io/programmatically-extract-a-zip-file-using-java

package com.test; 

import java.io.BufferedOutputStream; 
import java.io.ByteArrayInputStream; 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.util.zip.ZipEntry; 
import java.util.zip.ZipInputStream; 

public class ZipHelper { 

    private static final int BUFFER_SIZE = 4096; 

    public static void unzip(byte[] data, String dirName) throws IOException { 
     File destDir = new File(dirName); 
     if (!destDir.exists()) { 
      destDir.mkdir(); 
     } 
     ZipInputStream zipIn = new ZipInputStream(new ByteArrayInputStream(data)); 
     ZipEntry entry = zipIn.getNextEntry(); 

     while (entry != null) { 
      String filePath = dirName + File.separator + entry.getName(); 
      if (!entry.isDirectory()) { 
       // if the entry is a file, extracts it 
       extractFile(zipIn, filePath); 
      } else { 
       // if the entry is a directory, make the directory 
       File dir = new File(filePath); 
       dir.mkdir(); 
      } 
      zipIn.closeEntry(); 
      entry = zipIn.getNextEntry(); 
     } 
     zipIn.close(); 
    } 

    private static void extractFile(ZipInputStream zipIn, String filePath) throws IOException { 
     BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath)); 
     byte[] bytesIn = new byte[BUFFER_SIZE]; 
     int read = 0; 
     while ((read = zipIn.read(bytesIn)) != -1) { 
      bos.write(bytesIn, 0, read); 
     } 
     bos.close(); 
    } 
} 

然後使用此工具像這樣：

ZipHelper.unzip(downloadedBytes, "/path/to/directory"); 

Answer 2

的requesdt體應該是這樣的：

@RequestMapping(value = "/push/{id}", method = RequestMethod.POST, consumes = MediaType.APPLICATION_OCTET_STREAM_VALUE, produces=MediaType.APPLICATION_JSON_VALUE) 
@ResponseStatus(HttpStatus.OK) 
public String pushTransactions(@PathVariable("id") String id, @RequestBody byte[] str) throws MessagingException, JsonParseException, JsonMappingException, IOException { 

，並在控制器，你可以這樣做：

GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(str)); 
     ByteArrayOutputStream out = new ByteArrayOutputStream(); 
     int len; 
     while ((len = gis.read(buffer)) > 0) { 
      out.write(buffer, 0, len); 
     } 

     gis.close(); 
     out.close();