在之前一段的项目中，使用Java模仿Http Post方式发送参数以及文件，单纯的传递参数或者文件可以使用URLConnection进行相应的处理。

但是项目中涉及到既要传递普通参数，也要传递多个文件（不是单纯的传递XML文件）。在网上寻找之后，发现是使用HttClient来进行响应的操作，起初尝试多次依然不能传递参数和传递文件，后来发现时因为当使用HttpClient时，不能使用request.getParameter()对普通参数进行获取，而要在服务器端使用Upload来进行操作。

HttpClient4.2 jar下载 ：http://download.csdn.net/detail/just_szl/4370574

客户端代码：

import java.io.ByteArrayOutputStream; 
import java.io.File; 
import java.io.IOException; 
import java.io.InputStream; 
import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.HttpStatus; 
import org.apache.http.ParseException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.entity.mime.MultipartEntity; 
import org.apache.http.entity.mime.content.FileBody; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.util.EntityUtils; 
/** 
* 
* @author <a href="mailto:[email protected]"> Geray</a> 
* @version 1.0,2012-6-12 
*/ 
public class HttpPostArgumentTest2 { 
//file1与file2在同一个文件夹下 filepath是该文件夹指定的路径 
public void SubmitPost(String url,String filename1,String filename2, String filepath){ 
HttpClient httpclient = new DefaultHttpClient(); 
try { 
HttpPost httppost = new HttpPost(url); 
FileBody bin = new FileBody(new File(filepath + File.separator + filename1)); 
FileBody bin2 = new FileBody(new File(filepath + File.separator + filename2)); 
StringBody comment = new StringBody(filename1); 
MultipartEntity reqEntity = new MultipartEntity(); 
reqEntity.addPart("file1", bin);//file1为请求后台的File upload;属性 
reqEntity.addPart("file2", bin2);//file2为请求后台的File upload;属性 
reqEntity.addPart("filename1", comment);//filename1为请求后台的普通参数;属性 
httppost.setEntity(reqEntity); 
HttpResponse response = httpclient.execute(httppost); 
int statusCode = response.getStatusLine().getStatusCode(); 
if(statusCode == HttpStatus.SC_OK){ 
System.out.println("服务器正常响应....."); 
HttpEntity resEntity = response.getEntity(); 
System.out.println(EntityUtils.toString(resEntity));//httpclient自带的工具类读取返回数据 
System.out.println(resEntity.getContent()); 
EntityUtils.consume(resEntity); 
} 
} catch (ParseException e) { 
// TODO Auto-generated catch block 
e.printStackTrace(); 
} catch (IOException e) { 
// TODO Auto-generated catch block 
e.printStackTrace(); 
} finally { 
try { 
httpclient.getConnectionManager().shutdown(); 
} catch (Exception ignore) { 
} 
} 
} 
/** 
* @param args 
*/ 
public static void main(String[] args) { 
// TODO Auto-generated method stub 
HttpPostArgumentTest2 httpPostArgumentTest2 = new HttpPostArgumentTest2(); 
httpPostArgumentTest2.SubmitPost("http://127.0.0.1:8080/demo/receiveData.do", 
"test.xml","test.zip","D://test"); 
} 
} 

服务端代码：

public void receiveData(HttpServletRequest request, HttpServletResponse response) throws AppException{ 
PrintWriter out = null; 
response.setContentType("text/html;charset=UTF-8"); 
Map map = new HashMap(); 
FileItemFactory factory = new DiskFileItemFactory(); 
ServletFileUpload upload = new ServletFileUpload(factory); 
File directory = null; 
List<FileItem> items = new ArrayList(); 
try { 
items = upload.parseRequest(request); 
// 得到所有的文件 
Iterator<FileItem> it = items.iterator(); 
while (it.hasNext()) { 
FileItem fItem = (FileItem) it.next(); 
String fName = ""; 
Object fValue = null; 
if (fItem.isFormField()) { // 普通文本框的值 
fName = fItem.getFieldName(); 
// fValue = fItem.getString(); 
fValue = fItem.getString("UTF-8"); 
map.put(fName, fValue); 
} else { // 获取上传文件的值 
fName = fItem.getFieldName(); 
fValue = fItem.getInputStream(); 
map.put(fName, fValue); 
String name = fItem.getName(); 
if(name != null && !("".equals(name))) { 
name = name.substring(name.lastIndexOf(File.separator) + 1); 
// String stamp = StringUtils.getFormattedCurrDateNumberString(); 
String timestamp_Str = TimeUtils.getCurrYearYYYY(); 
directory = new File("d://test"); 
directory.mkdirs(); 
String filePath = ("d://test")+ timestamp_Str+ File.separator + name; 
map.put(fName + "FilePath", filePath); 
InputStream is = fItem.getInputStream(); 
FileOutputStream fos = new FileOutputStream(filePath); 
byte[] buffer = new byte[1024]; 
while (is.read(buffer) > 0) { 
fos.write(buffer, 0, buffer.length); 
} 
fos.flush(); 
fos.close(); 
map.put(fName + "FileName", name); 
} 
} 
} 
} catch (Exception e) { 
System.out.println("读取http请求属性值出错!"); 
// e.printStackTrace(); 
logger.error("读取http请求属性值出错"); 
} 
// 数据处理 
try { 
out = response.getWriter(); 
out.print("{success:true, msg:'接收成功'}"); 
out.close(); 
} catch (IOException e) { 
e.printStackTrace(); 
} 
} 

以上所述是小编给大家介绍的HttpClient通过Post上传文件的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！