Java实现表单提交（支持多文件同时上传）
在Android里面或者J2EE后台需要趴别人网站数据，模拟表单提交是一件很常见的事情，但是在Android里面要实现多文件上传，还要夹着普通表单字段上传，这下可能就有点费劲了，今天花时间整理了一个工具类，主要是借助于HttpClient，其实也很简单，看一下代码就非常清楚了
HttpClient工具类：
HttpClientUtil.java
packagecn.com.ajava.util;
importjava.io.File;
importjava.io.Serializable;
importjava.util.Iterator;
importjava.util.LinkedHashMap;
importjava.util.Map;
importjava.util.Map.Entry;
importorg.apache.http.Consts;
importorg.apache.http.HttpEntity;
importorg.apache.http.HttpResponse;
importorg.apache.http.client.HttpClient;
importorg.apache.http.client.methods.HttpPost;
importorg.apache.http.entity.ContentType;
importorg.apache.http.entity.mime.MultipartEntityBuilder;
importorg.apache.http.entity.mime.content.FileBody;
importorg.apache.http.entity.mime.content.StringBody;
importorg.apache.http.impl.client.DefaultHttpClient;
importorg.apache.http.util.EntityUtils;
/**
*HttpClient工具类
*
*@author曾繁添
*@version1.0
*/
publicclassHttpClientUtil
{
publicfinalstaticStringMethod_POST="POST";
publicfinalstaticStringMethod_GET="GET";
/**
*multipart/form-data类型的表单提交
*
*@paramform
*表单数据
*/
publicstaticStringsubmitForm(MultipartFormform)
{
//返回字符串
StringresponseStr="";
//创建HttpClient实例
HttpClienthttpClient=newDefaultHttpClient();
try
{
//实例化提交请求
HttpPosthttpPost=newHttpPost(form.getAction());
//创建MultipartEntityBuilder
MultipartEntityBuilderentityBuilder=MultipartEntityBuilder.create();
//追加普通表单字段
Map<String,String>normalFieldMap=form.getNormalField();
for(Iterator<Entry<String,String>>iterator=normalFieldMap.entrySet().iterator();iterator.hasNext();)
{
Entry<String,String>entity=iterator.next();
entityBuilder.addPart(entity.getKey(),newStringBody(entity.getValue(),ContentType.create("text/plain",Consts.UTF_8)));
}
//追加文件字段
Map<String,File>fileFieldMap=form.getFileField();
for(Iterator<Entry<String,File>>iterator=fileFieldMap.entrySet().iterator();iterator.hasNext();)
{
Entry<String,File>entity=iterator.next();
entityBuilder.addPart(entity.getKey(),newFileBody(entity.getValue()));
}
//设置请求实体
httpPost.setEntity(entityBuilder.build());
//发送请求
HttpResponseresponse=httpClient.execute(httpPost);
intstatusCode=response.getStatusLine().getStatusCode();
//取得响应数据
HttpEntityresEntity=response.getEntity();
if(200==statusCode)
{
if(resEntity!=null)
{
responseStr=EntityUtils.toString(resEntity);
}
}
}catch(Exceptione)
{
System.out.println("提交表单失败，原因："+e.getMessage());
}finally
{
httpClient.getConnectionManager().shutdown();
}
returnresponseStr;
}
/**表单字段Bean*/
publicclassMultipartFormimplementsSerializable
{
/**序列号*/
privatestaticfinallongserialVersionUID=-2138044819190537198L;
/**提交URL**/
privateStringaction="";
/**提交方式：POST/GET**/
privateStringmethod="POST";
/**普通表单字段**/
privateMap<String,String>normalField=newLinkedHashMap<String,String>();
/**文件字段**/
privateMap<String,File>fileField=newLinkedHashMap<String,File>();
publicStringgetAction()
{
returnaction;
}
publicvoidsetAction(Stringaction)
{
this.action=action;
}
publicStringgetMethod()
{
returnmethod;
}
publicvoidsetMethod(Stringmethod)
{
this.method=method;
}
publicMap<String,String>getNormalField()
{
returnnormalField;
}
publicvoidsetNormalField(Map<String,String>normalField)
{
this.normalField=normalField;
}
publicMap<String,File>getFileField()
{
returnfileField;
}
publicvoidsetFileField(Map<String,File>fileField)
{
this.fileField=fileField;
}
publicvoidaddFileField(Stringkey,Filevalue)
{
fileField.put(key,value);
}
publicvoidaddNormalField(Stringkey,Stringvalue)
{
normalField.put(key,value);
}
}
}
服务器端实现文件上传、并且读取参数方法：（借助于Apache的fileupload组件实现，实现了获取表单action后面直接拼接参数、表单普通项目、文件项目三种字段获取方法）
后台我就直接写了一个Servlet，具体代码如下：
ServletUploadFile.java
packagecn.com.ajava.servlet;
importjava.io.File;
importjava.io.IOException;
importjava.io.PrintWriter;
importjava.util.Enumeration;
importjava.util.Iterator;
importjava.util.List;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importorg.apache.commons.fileupload.FileItem;
importorg.apache.commons.fileupload.disk.DiskFileItemFactory;
importorg.apache.commons.fileupload.servlet.ServletFileUpload;
/**
*文件上传Servlet
*@author曾繁添
*/
publicclassServletUploadFileextendsHttpServlet
{
privatestaticfinallongserialVersionUID=1L;
//限制文件的上传大小1G
privateintmaxPostSize=1000*1024*10;
publicServletUploadFile()
{
super();
}
@Override
protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,
IOException
{
doPost(request,response);
}
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,
IOException
{
PrintWriterout=response.getWriter();
StringcontextPath=request.getSession().getServletContext().getRealPath("/");
StringwebDir="uploadfile"+File.separator+"images"+File.separator;
StringsystemPath=request.getContextPath();
StringbasePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+systemPath+"/";
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
try
{
DiskFileItemFactoryfactory=newDiskFileItemFactory();
factory.setSizeThreshold(1024*4);//设置写入大小
ServletFileUploadupload=newServletFileUpload(factory);
upload.setSizeMax(maxPostSize);//设置文件上传最大大小
System.out.println(request.getContentType());
//获取action后面拼接的参数(如：http://www.baidu.com?q=android)
EnumerationenumList=request.getParameterNames();
while(enumList.hasMoreElements()){
Stringkey=(String)enumList.nextElement();
Stringvalue=request.getParameter(key);
System.out.println(key+"="+value);
}
//获取提交表单项目
ListlistItems=upload.parseRequest(request);
Iteratoriterator=listItems.iterator();
while(iterator.hasNext())
{
FileItemitem=(FileItem)iterator.next();
//非普通表单项目
if(!item.isFormField())
{
//获取扩展名
Stringext=item.getName().substring(item.getName().lastIndexOf("."),item.getName().length());
StringfileName=System.currentTimeMillis()+ext;
FiledirFile=newFile(contextPath+webDir+fileName);
if(!dirFile.exists())
{
dirFile.getParentFile().mkdirs();
}
item.write(dirFile);
System.out.println("fileName："+item.getName()+"====="+item.getFieldName()+"size："+item.getSize());
System.out.println("文件已保存到："+contextPath+webDir+fileName);
//响应客户端请求
out.print(basePath+webDir.replace("\\","/")+fileName);
out.flush();
}else{
//普通表单项目
System.out.println("表单普通项目："+item.getFieldName()+"="+item.getString("UTF-8"));//显示表单内容。item.getString("UTF-8")可以保证中文内容不乱码
}
}
}catch(Exceptione)
{
e.printStackTrace();
}finally
{
out.close();
}
}
}
工具类、服务器端代码上面都贴出来了，具体怎么调用应该就不需要说了吧？封装的已经够清晰明了了
调用示例DEMO：
//创建HttpClientUtil实例
HttpClientUtilhttpClient=newHttpClientUtil();
MultipartFormform=httpClient.newMultipartForm();
//设置form属性、参数
form.setAction("http://192.168.1.7:8080/UploadFileDemo/cn/com/ajava/servlet/ServletUploadFile");
FilephotoFile=newFile(sddCardPath+"//data//me.jpg");
form.addFileField("photo",photoFile);
form.addNormalField("name","曾繁添");
form.addNormalField("tel","15122946685");
//提交表单
HttpClientUtil.submitForm(form);
最后说明一下jar问题：
要是android里面应用的话，需要注意一下额外引入httpmime-4.3.1.jar（我当时下的这个是最高版本了），至于fileUpload的jar，直接去apache官网下载吧
以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持毛票票！