简单的上传功能却花了我好多时间和精力，各种小问题不断，现在记录下来，以供参考
直接上代码
客户端
<span style="font-size:14px;">/**
* 提交数据到服务器
*
* @param path
* 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://
* www.itcast.cn或http://192.168.1.10:8080这样的路径测试)
* @param params
* 请求参数 key为参数名,value为参数值
* @param encode
* 编码
*/
public static boolean postFromHttpClient2(String path,
Map<String, String> params, String encode, File file) {
HttpClient httpclient = null;
HttpResponse response = null;
MultipartEntity entity = new MultipartEntity();
try {
httpclient = new DefaultHttpClient();// 看作是浏览器
HttpPost httppost = new HttpPost(path);
FileBody fileBody = new FileBody(file);
entity.addPart("file", fileBody);
if (params != null && !params.isEmpty()) {
for (Map.Entry<String, String> entry : params.entrySet()) {
StringBody contentBody = new StringBody(entry.getValue(),
"text/plain", Charset.forName("UTF-8"));
entity.addPart(entry.getKey(), contentBody);
}
}
httppost.setEntity(entity);
response = httpclient.execute(httppost);// 发送post请求
// response.getEntity().getContent();
int code = response.getStatusLine().getStatusCode();
System.out.println(response.getStatusLine());
if (code == 200) {
return true;
} else {
return false;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
}
return false;
}</span>
服务器端如下：
<span style="font-size:14px;">public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart) {
// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();
// Configure a repository (to ensure a secure temp location is used)
ServletContext servletContext = this.getServletConfig()
.getServletContext();
File repository = (File) servletContext
.getAttribute("javax.servlet.context.tempdir");
factory.setRepository(repository);
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// Parse the request
try {
List<FileItem> items = upload.parseRequest(request);
Iterator<FileItem> iterator = items.iterator();
String dir = request.getSession().getServletContext()
.getRealPath("/files");
File dirFile = new File(dir);
if (!dirFile.exists()) {
dirFile.mkdirs();
}
while (iterator.hasNext()) {
FileItem fileItem = iterator.next();
if (fileItem.isFormField()) {// 如果是文本类型参数
String name = fileItem.getFieldName();
String value = fileItem.getString();
System.out.println(name + " " + value);
} else {
// 如果是文件类型参数
System.out.println("文件路径：" + dir);
File file = new File(dir, fileItem.getName());
fileItem.write(file);
}
}
} catch (FileUploadException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} else {
this.doGet(request, response);
}
}
</span>
另：参考如下文章 ，此文章专门介绍httpclient
http://blog.csdn.net/dww410/article/details/6608695
除了传统的application/x-www-form-urlencoded表单，我们另一个经常用到的是上传文件用的表单，这种表单的类型为 multipart/form-data。在HttpClient程序扩展包（HttpMime）中专门有一个类与之对应，那就是 MultipartEntity类。此类同样实现了HttpEntity接口。如下面的表单： <form action="http://localhost/index.html" method="POST" enctype="multipart/form-data"> <input type="text" name="param1" value="中国"/> <input type="text" name="param2" value="value2"/> <input type="file" name="param3"/> <inupt type="submit" value="submit"/> </form> 我们可以用下面的代码实现： MultipartEntity entity = new MultipartEntity(); entity.addPart("param1", new StringBody("中国", Charset.forName("UTF-8"))); entity.addPart("param2", new StringBody("value2", Charset.forName("UTF-8"))); entity.addPart("param3", new FileBody(new File("C:\\1.txt"))); HttpPost request = new HttpPost(“http://localhost/index.html”); request.setEntity(entity);使用socket拼接方式进行表单及文件的上传时：
public static boolean post(String path, Map<String, String> params,
FormFile[] files) throws Exception {
final String BOUNDARY = "---------------------------7da2137580612"; // 数据分隔线
final String endline = "--" + BOUNDARY + "--\r\n";// 数据结束标志
int fileDataLength = 0;
for (FormFile uploadFile : files) {// 得到文件类型数据的总长度
StringBuilder fileExplain = new StringBuilder();
fileExplain.append("--");
fileExplain.append(BOUNDARY);
fileExplain.append("\r\n");
fileExplain.append("Content-Disposition: form-data;name=\""
+ uploadFile.getParameterName() + "\";filename=\""
+ uploadFile.getFilname() + "\"\r\n");
fileExplain.append("Content-Type: " + uploadFile.getContentType()
+ "\r\n\r\n");
fileDataLength += fileExplain.length();
if (uploadFile.getInStream() != null) {
fileDataLength += uploadFile.getFile().length();
} else {
fileDataLength += uploadFile.getData().length;
}
fileDataLength += "\r\n".length();
}
StringBuilder textEntity = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet()) {// 构造文本类型参数的实体数据
textEntity.append("--");
textEntity.append(BOUNDARY);
textEntity.append("\r\n");
textEntity.append("Content-Disposition: form-data; name=\""
+ entry.getKey() + "\"\r\n\r\n");
textEntity.append(entry.getValue());
textEntity.append("\r\n");
}
// 计算传输给服务器的实体数据总长度
int dataLength = textEntity.toString().getBytes().length
+ fileDataLength + endline.getBytes().length;
URL url = new URL(path);
int port = url.getPort() == -1 ? 80 : url.getPort();
Socket socket = new Socket(InetAddress.getByName(url.getHost()), port);
OutputStream outStream = socket.getOutputStream();
// 下面完成HTTP请求头的发送
String requestmethod = "POST " + url.getPath() + " HTTP/1.1\r\n";
outStream.write(requestmethod.getBytes());
String accept = "Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n";
outStream.write(accept.getBytes());
String language = "Accept-Language: zh-CN\r\n";
outStream.write(language.getBytes());
String contenttype = "Content-Type: multipart/form-data; boundary="
+ BOUNDARY + "\r\n";
outStream.write(contenttype.getBytes());
String contentlength = "Content-Length: " + dataLength + "\r\n";
outStream.write(contentlength.getBytes());
String alive = "Connection: Keep-Alive\r\n";
outStream.write(alive.getBytes());
String host = "Host: " + url.getHost() + ":" + port + "\r\n";
outStream.write(host.getBytes());
// 写完HTTP请求头后根据HTTP协议再写一个回车换行
outStream.write("\r\n".getBytes());
// 把所有文本类型的实体数据发送出来
outStream.write(textEntity.toString().getBytes());
// 把所有文件类型的实体数据发送出来
for (FormFile uploadFile : files) {
StringBuilder fileEntity = new StringBuilder();
fileEntity.append("--");
fileEntity.append(BOUNDARY);
fileEntity.append("\r\n");
fileEntity.append("Content-Disposition: form-data;name=\""
+ uploadFile.getParameterName() + "\";filename=\""
+ uploadFile.getFilname() + "\"\r\n");
fileEntity.append("Content-Type: " + uploadFile.getContentType()
+ "\r\n\r\n");
outStream.write(fileEntity.toString().getBytes());
if (uploadFile.getInStream() != null) {
// 这里实现了一边读一边写
byte[] buffer = new byte[1024];
int len = 0;
while ((len = uploadFile.getInStream().read(buffer, 0, 1024)) != -1) {
outStream.write(buffer, 0, len);
}
uploadFile.getInStream().close();
} else {
outStream.write(uploadFile.getData(), 0,
uploadFile.getData().length);
}
outStream.write("\r\n".getBytes());
}
// 下面发送数据结束标志，表示数据已经结束
outStream.write(endline.getBytes());
BufferedReader reader = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
if (reader.readLine().indexOf("200") == -1) {// 读取web服务器返回的数据，判断请求码是否为200，如果不是200，代表请求失败
return false;
}
outStream.flush();
outStream.close();
reader.close();
socket.close();
return true;
}
类FormFile.java
package com.shuyan.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
/**
* 上传文件
*/
public class FormFile {
/* 上传文件的数据 */
private byte[] data;
private InputStream inStream;
private File file;
/* 文件名称 */
private String filname;
/* 请求参数名称 */
private String parameterName;
/* 内容类型 */
private String contentType = "application/octet-stream";
/**
* 适合小数据，因为需要将数据读入内存
*
* @param filname
* @param data
* @param parameterName
* @param contentType
*/
public FormFile(String filname, byte[] data, String parameterName,
String contentType) {
this.data = data;
this.filname = filname;
this.parameterName = parameterName;
if (contentType != null)
this.contentType = contentType;
}
/**
* 一般情况下使用此方法，但为了防止文件过大，后面应该优化为一边读数据一边上传
*
* @param file
* @param parameterName
* @param contentType
*/
public FormFile(File file, String parameterName, String contentType) {
this.filname = file.getName();
this.parameterName = parameterName;
this.file = file;
try {
this.inStream = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
if (contentType != null)
this.contentType = contentType;
}
public File getFile() {
return file;
}
public InputStream getInStream() {
return inStream;
}
public byte[] getData() {
return data;
}
public String getFilname() {
return filname;
}
public void setFilname(String filname) {
this.filname = filname;
}
public String getParameterName() {
return parameterName;
}
public void setParameterName(String parameterName) {
this.parameterName = parameterName;
}
public String getContentType() {
return contentType;
}
public void setContentType(String contentType) {
this.contentType = contentType;
}
}
这篇文章写的不错
文件上传和下载：http://www.cnblogs.com/xdp-gacl/p/4200090.html
POST格式：http://www.cnblogs.com/kaixuan/archive/2008/01/31/1060284.html
代码留着以后用到时看：http://download.csdn.net/detail/leokelly001/8411597