java客户端模拟表单上传文件

2015/05/06 33612

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package client;
   
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
   
public class FileUpload {
   
    /**
     * 发送请求
     *
     * @param url
     *            请求地址
     * @param filePath
     *            文件在服务器保存路径（这里是为了自己测试方便而写，可以将该参数去掉）
     * @return
     * @throws IOException
     */
    public int send(String url, String filePath) throws IOException {
   
        File file = new File(filePath);
        if (!file.exists() || !file.isFile()) {
            return -1;
        }
   
        /**
         * 第一部分
         */
        URL urlObj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();
   
        /**
         * 设置关键值
         */
        con.setRequestMethod("POST"); // 以Post方式提交表单，默认get方式
        con.setDoInput(true);
        con.setDoOutput(true);
        con.setUseCaches(false); // post方式不能使用缓存
   
        // 设置请求头信息
        con.setRequestProperty("Connection", "Keep-Alive");
        con.setRequestProperty("Charset", "UTF-8");
   
        // 设置边界
        String BOUNDARY = "----------" + System.currentTimeMillis();
        con.setRequestProperty("Content-Type", "multipart/form-data; boundary="
                + BOUNDARY);
   
        // 请求正文信息
   
        // 第一部分：
        StringBuilder sb = new StringBuilder();
        sb.append("--"); // ////////必须多两道线
        sb.append(BOUNDARY);
        sb.append("\\r\\n");
        sb.append("Content-Disposition: form-data;name=\\"file\\";filename=\\""
                + file.getName() + "\\"\\r\\n");
        sb.append("Content-Type:application/octet-stream\\r\\n\\r\\n");
   
        byte[] head = sb.toString().getBytes("utf-8");
   
        // 获得输出流
   
        OutputStream out = new DataOutputStream(con.getOutputStream());
        out.write(head);
   
        // 文件正文部分
        DataInputStream in = new DataInputStream(new FileInputStream(file));
        int bytes = 0;
        byte[] bufferOut = new byte[1024];
        while ((bytes = in.read(bufferOut)) != -1) {
            out.write(bufferOut, 0, bytes);
        }
        in.close();
   
        // 结尾部分
        byte[] foot = ("\\r\\n--" + BOUNDARY + "--\\r\\n").getBytes("utf-8");// 定义最后数据分隔线
   
        out.write(foot);
   
        out.flush();
        out.close();
   
        /**
         * 读取服务器响应，必须读取,否则提交不成功
         */
   
        return con.getResponseCode();
   
        /**
         * 下面的方式读取也是可以的
         */
   
        // try {
        // // 定义BufferedReader输入流来读取URL的响应
        // BufferedReader reader = new BufferedReader(new InputStreamReader(
        // con.getInputStream()));
        // String line = null;
        // while ((line = reader.readLine()) != null) {
        // System.out.println(line);
        // }
        // } catch (Exception e) {
        // System.out.println("发送POST请求出现异常！" + e);
        // e.printStackTrace();
        // }
   
    }
   
    public static void main(String[] args) throws IOException {
        FileUpload up = new FileUpload();
        System.out.println(up.send("http://localhost:8080/fileupload/upload",
                "c:\\\\girls.gif"));
        ;
    }
}