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:just_szl@hotmail.com"> 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菜鸟教程(cainiaojc.com)网站的支持！
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