Android中发送Http请求实例

Android中发送Http请求实例（包括文件上传、servlet接收）

http, post, 上传文件
本帖最后由 xinke7hao 于 2010-6-12 13:43 编辑

前天开始要准备实现手机端往服务器传参数，还要能传附件，找了不少文章和资料，现在总结一下分享分享：代码中的catch什么的就省略了，尝试了图片、txt、xml是没问题的.. 各位尽情拍砖吧。

发完发现代码部分的格式……这个编辑器不太会用，怎么感觉把换行都去掉了,处理好换行缩进也……

首先我是写了个java工程测试发送post请求：可以包含文本参数和文件参数****************************************************
/** * 通过http协议提交数据到服务端，实现表单提交功能，包括上传文件 * @param actionUrl 上传路径 * @param params 请求参数 key为参数名,value为参数值 * @param file 上传文件 */ public static void postMultiParams(String actionUrl, Map<String, String> params, FormBean[] files) { try { PostMethod post = new PostMethod(actionUrl); List<art> formParams = new ArrayList<art>(); for(Map.Entry<String, String> entry : params.entrySet()){ formParams.add(new StringPart(entry.getKey(), entry.getValue())); } if(files!=null) for(FormBean file : files){ //filename为在服务端接收时希望保存成的文件名，filepath是本地文件路径(包括了源文件名)，filebean中就包含了这俩属性 formParams.add(new FilePart("file", file.getFilename(), new File(file.getFilepath()))); } Part[] parts = new Part[formParams.size()]; Iterator<art> pit = formParams.iterator(); int i=0; while(pit.hasNext()){ parts[i++] = pit.next(); } //如果出现乱码可以尝试一下方式 //StringPart sp = new StringPart("TEXT", "testValue", "GB2312");  //FilePart fp = new FilePart("file", "test.txt", new File("./temp/test.txt"), null, "GB2312" //postMethod.getParams().setContentCharset("GB2312"); MultipartRequestEntity mrp = new MultipartRequestEntity(parts, post.getParams()); post.setRequestEntity(mrp); //execute post method HttpClient client = new HttpClient(); int code = client.executeMethod(post); System.out.println(code); } catch ... } 复制代码 通过以上代码可以成功的模拟java客户端发送post请求，服务端也能接收并保存文件 java端测试的main方法： public static void main(String[] args){ String actionUrl = "http://192.168.0.123:8080/WSserver/androidUploadServlet"; Map<String, String> strParams = new HashMap<String, String>(); strParams.put("paramOne", "valueOne"); strParams.put("paramTwo", "valueTwo"); FormBean[] files = new FormBean[]{new FormBean("dest1.xml", "F:/testpostsrc/main.xml")}; HttpTool.postMultiParams(actionUrl,strParams,files); } 复制代码 本以为大功告成了，结果一移植到android工程中，编译是没有问题的。 但是运行时抛了异常 先是说找不到PostMethod类，org.apache.commons.httpclient.methods.PostMethod这个类绝对是有包含的； 还有个异常就是VerifyError。 开发中有几次碰到这个异常都束手无策，觉得是SDK不兼容还是怎么地，哪位知道可得跟我说说～～ 于是看网上有直接分析http request的内容构建post请求的，也有找到带上传文件的，拿下来运行老是有些问题，便直接通过运行上面的java工程发送的post请求，在servlet中打印出请求内容，然后对照着拼接字符串和流终于给实现了！代码如下： *********************************************************** /** * 通过拼接的方式构造请求内容，实现参数传输以及文件传输 * @param actionUrl * @param params * @param files * @return * @throws IOException */ public static String post(String actionUrl, Map<String, String> params, Map<String, File> files) throws IOException { String BOUNDARY = java.util.UUID.randomUUID().toString(); String PREFIX = "--" , LINEND = "\r\n"; String MULTIPART_FROM_DATA = "multipart/form-data"; String CHARSET = "UTF-8"; URL uri = new URL(actionUrl); HttpURLConnection conn = (HttpURLConnection) uri.openConnection(); conn.setReadTimeout(5 * 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); // 首先组拼文本类型的参数 StringBuilder sb = new StringBuilder(); 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()); outStream.write(sb.toString().getBytes()); // 发送文件数据 if(files!=null) for (Map.Entry<String, File> file: files.entrySet()) { StringBuilder sb1 = new StringBuilder(); sb1.append(PREFIX); sb1.append(BOUNDARY); sb1.append(LINEND); sb1.append("Content-Disposition: form-data; name=\"file\"; filename=\""+file.getKey()+"\""+LINEND); sb1.append("Content-Type: application/octet-stream; charset="+CHARSET+LINEND); sb1.append(LINEND); outStream.write(sb1.toString().getBytes()); InputStream is = new FileInputStream(file.getValue()); 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(); if (res == 200) { InputStream in = conn.getInputStream(); int ch; StringBuilder sb2 = new StringBuilder(); while ((ch = in.read()) != -1) { sb2.append((char) ch); } } outStream.close(); conn.disconnect(); return in.toString(); } 复制代码 ********************** button响应中的代码： ********************** public void onClick(View v){ String actionUrl = getApplicationContext().getString(R.string.wtsb_req_upload); Map<String, String> params = new HashMap<String, String>(); params.put("strParamName", "strParamValue"); Map<String, File> files = new HashMap<String, File>(); files.put("tempAndroid.txt", new File("/sdcard/temp.txt")); try { HttpTool.postMultiParams(actionUrl, params, files); } catch ... 复制代码 *************************** 服务器端servlet代码： *************************** public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //print request.getInputStream to check request content //HttpTool.printStreamContent(request.getInputStream()); RequestContext req = new ServletRequestContext(request); if(FileUpload.isMultipartContent(req)){ DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload fileUpload = new ServletFileUpload(factory); fileUpload.setFileSizeMax(FILE_MAX_SIZE); List items = new ArrayList(); try { items = fileUpload.parseRequest(request); } catch ... Iterator it = items.iterator(); while(it.hasNext()){ FileItem fileItem = (FileItem)it.next(); if(fileItem.isFormField()){ System.out.println(fileItem.getFieldName()+" "+fileItem.getName()+" "+new String(fileItem.getString().getBytes("ISO-8859-1"),"GBK")); } else { System.out.println(fileItem.getFieldName()+" "+fileItem.getName()+" "+ fileItem.isInMemory()+" "+fileItem.getContentType()+" "+fileItem.getSize()); if(fileItem.getName()!=null && fileItem.getSize()!=0){ File fullFile = new File(fileItem.getName()); File newFile = new File(FILE_SAVE_PATH+fullFile.getName()); try { fileItem.write(newFile); } catch ... } else { System.out.println("no file choosen or empty file"); } } } } } public void init() throws ServletException { //读取在web.xml中配置的init-param   FILE_MAX_SIZE = Long.parseLong(this.getInitParameter("file_max_size"));//上传文件大小限制  FILE_SAVE_PATH = this.getInitParameter("file_save_path");//文件保存位置 }
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