android 自定义拼接http报文

在android开发中通常http请求，文件上传都交由成熟框架实现，这样是十分正确的行为，但是由于某些特殊的需求问题，仍需掌握最原始的http报文的自定义拼接，才能完成这些特殊的需求。如存在问题使用Fiddler4抓包与后台分析报文区别修改即可。

package com.smarthome.anbao.utils;
import android.text.TextUtils;
import com.Player.web.websocket.ClientCore;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

/**
 * Created by 袁祖强 on 2017/7/18.
 */
public class UploadFileUtil {
    private String url;
    private Map<String, String> headParams;
    private Map<String, String> params;
    private List<String> files;
    private UploadFileListener uploadFileListener;
    public UploadFileUtil(String url,Map<String, String> headParams,Map<String, String> params,List<String> files,UploadFileListener uploadFileListener){
        this.url = url;
        this.headParams = headParams;
        this.params = params;
        this.files = files;
        this.uploadFileListener = uploadFileListener;
    }
    public void uploadDone(){
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    UploadFile();
                } catch (IOException e) {
                    uploadFileListener.uploadError(e.toString());
                    e.printStackTrace();
                }
            }
        });
        thread.start();
    }
    public  void UploadFile() throws IOException {
        String BOUNDARY = java.util.UUID.randomUUID().toString();
        String PREFIX = "--", LINEND = "\r\n";
        String MULTIPART_FROM_DATA = "multipart/form-data";//提交方式，二进制表单提交
        String CHARSET = "UTF-8";

        URL uri = new URL(url);
        HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
        conn.setReadTimeout(30 * 1000); // 缓存的最长时间
        conn.setDoInput(true);// 允许输入
        conn.setDoOutput(true);// 允许输出
        conn.setUseCaches(false); // 不允许使用缓存
        conn.setRequestMethod("POST");
        conn.setRequestProperty("connection", "keep-alive");
        conn.setRequestProperty("Charsert", "UTF-8");
        conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);
        uploadFileListener.uploadStart();
        if(headParams != null){
            for(String key : headParams.keySet()){
                conn.setRequestProperty(key, headParams.get(key));
            }
        }
        StringBuilder sb = new StringBuilder();
        if (params != null) {
            for (Map.Entry<String, String> entry : params.entrySet()) {
                sb.append(PREFIX);
                sb.append(BOUNDARY);
                sb.append(LINEND);
                sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);
                sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);
                sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
                sb.append(LINEND);
                sb.append(entry.getValue());
                sb.append(LINEND);
            }
        }

        DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());//获取输出流
        if (!TextUtils.isEmpty(sb.toString())) {
            outStream.write(sb.toString().getBytes());
        }

        if (files.size() > 0)
            for (int i = 0 ; i < files.size() ; i++) {
                File file = new File(files.get(i));
                StringBuilder sb1 = new StringBuilder();
                sb1.append(PREFIX);
                sb1.append(BOUNDARY);
                sb1.append(LINEND);
                sb1.append("S:" + ClientCore.SESSION_ID + LINEND);//添加session 校验
                sb1.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + file.getName() + "\"" + LINEND);
                sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);
                sb1.append(LINEND);
                outStream.write(sb1.toString().getBytes());
                InputStream is = new FileInputStream(file);
                byte[] buffer = new byte[1024];
                int len = 0;
                while ((len = is.read(buffer)) != -1) {
                    outStream.write(buffer, 0, len);
                }
                is.close();
                outStream.write(LINEND.getBytes());
            }

        // 请求结束标志
        byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
        outStream.write(end_data);
        outStream.flush();
        // 得到响应码
        int res = conn.getResponseCode();
        InputStream in = conn.getInputStream();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
        StringBuffer buffer = new StringBuffer();
        String line = "";
        while ((line = bufferedReader.readLine()) != null){
            buffer.append(line);
        }
        if (res == 200) {
            uploadFileListener.uploadFinish(buffer.toString());
        }else{
            uploadFileListener.uploadError(in.toString());
        }
        outStream.close();
        conn.disconnect();
    }
}