简单的文件上传到Servlet 采用的httpclient

需要在android端加入commons-httpclient-3.1.jar 文件 而servlet端需要 fileupload和io 的jar包

代码如下  比较简单、

1.Http上传封装好的类

package com.example.root.ppload;

import java.io.File;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.multipart.FilePart;
import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.commons.httpclient.methods.multipart.Part;
import org.apache.commons.httpclient.methods.multipart.StringPart;

public class Hclient
{
    public void UpLoadFile(String str) {
        String targetURL = null;
        File targetFile = null;
        targetFile = new File(str);
        targetURL = "http://10.0.2.2:8899/Fuck/upload"; // servleturl
        PostMethod filePost = new PostMethod(targetURL);
        try {
            /**
             * Filepart存入文件
             * StringPart存入想要附带的参数
             */
            Part[] parts =
                    {new FilePart(targetFile.getName(), targetFile)
                    ,new StringPart("name","xingshang")};
            filePost.setRequestEntity(new MultipartRequestEntity(
                    parts, filePost.getParams()));
            HttpClient client = new HttpClient();
            client.getHttpConnectionManager().getParams()
                    .setConnectionTimeout(5000);
            int status = client.executeMethod(filePost);
            if (status == HttpStatus.SC_OK) {
                System.out.println("上传成功");
                // 上传成功
            } else {
                System.out.println("上传失败");
                // 上传失败
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            filePost.releaseConnection();
        }
    }
}

接下来就是M啊inActivity、

package com.example.root.ppload;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.StrictMode;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;

public class MainActivity extends Activity {

    private Button mButton;
    private String str1 = Environment.getExternalStorageDirectory()+"/android.txt";
    private String str2 = Environment.getExternalStorageDirectory()+"/1.c";
    private int mFlag = 0;
    Hclient hclient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mButton = (Button) findViewById(R.id.sub);
        hclient = new Hclient();
        mButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                mFlag++;
                if (mFlag == 1) {
                    hclient.UpLoadFile(str1);
                    hclient.UpLoadFile(str2);
                } else if (mFlag == 2) {
                    hclient.UpLoadFile(str2);
                } else {
                }
            }
        });
    }
}

Servlet如下

package com.web.cn;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.output.ThresholdingOutputStream;

public class TestServlets extends HttpServlet

{
 private String uploadPath = "C:\\Users\\root\\Desktop\\files\\"; // 上传文件的目录
 private File tempPathFile;
 public void init() throws ServletException {
  File uploadFile = new File(uploadPath);
  if (!uploadFile.exists()) {
   uploadFile.mkdirs();
  }
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  try {
   File savedFile = null;
   // Create a factory for disk-based file items
   DiskFileItemFactory factory = new DiskFileItemFactory();
   // Set factory constraints
   factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb
   factory.setRepository(tempPathFile);// 设置缓冲区目录
   // Create a new file upload handler
   ServletFileUpload upload = new ServletFileUpload(factory);
   // Set overall request size constraint
   upload.setSizeMax(4194304); // 设置最大文件尺寸，这里是4MB
   List items = upload.parseRequest(request);// 得到所有的文件
   Iterator i = items.iterator();
   while (i.hasNext()) {
    FileItem fi = (FileItem) i.next();
    if(fi.isFormField()){
     System.out.println(fi.getFieldName()+"/"+fi.getString());
    }else{
     String fileName = fi.getName();
     System.out.println(fileName);
     if (fileName != null) {
      savedFile = new File(uploadPath, fileName);
      fi.write(savedFile);
     }
    }
   }
   System.out.println(savedFile.getAbsolutePath());
   System.out.print("upload succeed");
  } catch (Exception e) {
   System.out.println(e.getMessage());
   // 可以跳转出错页面
   e.printStackTrace();
  }
 }
}

需要的就是在web.xml中声明的哦