Java利用HttpClient模拟POST表单操作应用及注意事项
HttpClient使用post方法提交数据源代码：
packagepost;
importJava.io.IOException;
importorg.apache.commons.httpclient.Header;
importorg.apache.commons.httpclient.HttpClient;
importorg.apache.commons.httpclient.HttpException;
importorg.apache.commons.httpclient.HttpStatus;
importorg.apache.commons.httpclient.NameValuePair;
importorg.apache.commons.httpclient.methods.PostMethod;
publicclassPostHttp{
/**
*@paramargs
*/
publicstaticvoidmain(String[]args){
//TODOAuto-generatedmethodstub
HttpClienthttpClient=newHttpClient();
Stringurl="http://193.167.13.21/setup.cgi";
PostMethodpostMethod=newPostMethod(url);
// 填入各个表单域的值
NameValuePair[]data={
newNameValuePair("ID","11"),
newNameValuePair("mtg","0"),
newNameValuePair("haveCookie","0"),
newNameValuePair("backID","30"),
newNameValuePair("psw","password")
};
// 将表单的值放入postMethod中
postMethod.setRequestBody(data);
// 执行postMethod
intstatusCode=0;
try{
statusCode=httpClient.executeMethod(postMethod);
}catch(HttpExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
// HttpClient对于要求接受后继服务的请求，象POST和PUT等不能自动处理转发
// 301或者302
if(statusCode==HttpStatus.SC_MOVED_PERMANENTLY||statusCode==HttpStatus.SC_MOVED_TEMPORARILY)
{
// 从头中取出转向的地址
HeaderlocationHeader=postMethod.getResponseHeader("location");
Stringlocation=null;
if(locationHeader!=null){
location=locationHeader.getValue();
System.out.println("Thepagewasredirectedto:"+location);
}
else{
System.err.println("Locationfieldvalueisnull.");
}
return;
}
else
{
System.out.println(postMethod.getStatusLine());
Stringstr="";
try{
str=postMethod.getResponseBodyAsString();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
System.out.println(str);
}
postMethod.releaseConnection();
return;
}
}
//这是一个用户认证过程的登陆信息
其中需要的jar包：
1、commons-httpclient-3.1-rc1.ziphttp://jakarta.apache.org/commons/httpclient/downloads.html
2、commons-codec-1.3.jar http://jakarta.apache.org/site/downloads/downloads_commons-codec.cgi
3、commons-logging-api.jar 在tomcat5.5中的Tomcat5.5/bin目录下或者 http://jakarta.apache.org/site/downloads/downloads_commons-logging.cgi