HttpClient post 请求实例

所需jar包：

commons-codec-1.3.jar

commons-httpclient-3.0.jar

commons-logging-1.1.1.jar

/**
*
*/
package httpClient;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URLEncoder;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;

/**
* @ClassName: SimpleClient
* @Description: TODO(这里用一句话描述这个类的作用)
* @author zhoushun
* @date 2014年2月13日 上午9:35:17
*
*/
public class SimpleClient {
public static void main(String[] args) throws IOException
{
HttpClient client = new HttpClient();
//设置代理服务器地址和端口
//client.getHostConfiguration().setProxy("proxy_host_addr",proxy_port);
//使用GET方法，如果服务器需要通过HTTPS连接，那只需要将下面URL中的http换成https
// HttpMethod method = new GetMethod("http://10.1.14.20:8088/workflowController/service/todo/addTask");
//使用POST方法
PostMethod method = new PostMethod("http://10.1.14.20:8088/workflowController/service/todo/addTask");

String s = "http://10.1.48.16:8080/workflow/send-tDocSend/toFormPage.action?modelName=%E6%96%B0%E5%8F%91%E6%96%87%E6%B5%81%E7%A8%8B&incidentNo=65&processName=%E6%96%B0%E5%8F%91%E6%96%87%E6%B5%81%E7%A8%8B&pinstanceId=65&taskUserName=ST/G001000001612549&stepName=%E5%8F%91%E6%96%87%E9%80%9A%E7%9F%A5&taskId=12261064757e7498937e6b29ea80ca&taskuser=ST/G001000001612549&codeId=13";

String ms = "{\"app\": \"standardWork\",\"type\": 0,"
+ "\"occurTime\": \"2013-11-14 11:22:02\",\"title\": \"-------流程标题-------\","
+ "\"loginName\": \"ST/G01008000311\",\"status\": 0,\"removed\": 0,"
+ " \"typename\": \"流程名称11\","
+ "\"url\": \""+URLEncoder.encode(s,"UTF-8")+"\","
+ "\"pname\": \"主流程名称\",\"pincident\": 1,"
+ "\"cname\": \"子流程实例号\",\"cincident\": 1,"
+ "\"stepName\": \"当前步骤\","
+ "\"initiator\": \"ST/G01008000311\"}";
((PostMethod) method).addParameter("data", ms);

HttpMethodParams param = method.getParams();
param.setContentCharset("UTF-8");

client.executeMethod(method);
//打印服务器返回的状态
System.out.println(method.getStatusLine());
//打印返回的信息
System.out.println();
InputStream stream = method.getResponseBodyAsStream();

BufferedReader br = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
StringBuffer buf = new StringBuffer();
String line;
while (null != (line = br.readLine())) {
buf.append(line).append("\n");
}
System.out.println(buf.toString());
//释放连接
method.releaseConnection();
}
}

另附上 新浪微博 上的 调用demo中的一些 方法：

public HttpClient(int maxConPerHost, int conTimeOutMs, int soTimeOutMs,
int maxSize) {
connectionManager = new MultiThreadedHttpConnectionManager();
HttpConnectionManagerParams params = connectionManager.getParams();
params.setDefaultMaxConnectionsPerHost(maxConPerHost);
params.setConnectionTimeout(conTimeOutMs);
params.setSoTimeout(soTimeOutMs);

HttpClientParams clientParams = new HttpClientParams();
// 忽略cookie 避免 Cookie rejected 警告
clientParams.setCookiePolicy(CookiePolicy.IGNORE_COOKIES);
client = new org.apache.commons.httpclient.HttpClient(clientParams,
connectionManager);
Protocol myhttps = new Protocol("https", new MySSLSocketFactory(), 443);
Protocol.registerProtocol("https", myhttps);
this.maxSize = maxSize;
// 支持proxy
if (proxyHost != null && !proxyHost.equals("")) {
client.getHostConfiguration().setProxy(proxyHost, proxyPort);
client.getParams().setAuthenticationPreemptive(true);
if (proxyAuthUser != null && !proxyAuthUser.equals("")) {
client.getState().setProxyCredentials(
AuthScope.ANY,
new UsernamePasswordCredentials(proxyAuthUser,
proxyAuthPassword));
log("Proxy AuthUser: " + proxyAuthUser);
log("Proxy AuthPassword: " + proxyAuthPassword);
}
}
}

/**
* log调试
*
*/
private static void log(String message) {
if (DEBUG) {
log.debug(message);
}
}

/**
* 处理http getmethod 请求
*
*/

public Response get(String url) throws WeiboException {

return get(url, new PostParameter[0]);

}

public Response get(String url, PostParameter[] params)
throws WeiboException {
log("Request:");
log("GET:" + url);
if (null != params && params.length > 0) {
String encodedParams = HttpClient.encodeParameters(params);
if (-1 == url.indexOf("?")) {
url += "?" + encodedParams;
} else {
url += "&" + encodedParams;
}
}
GetMethod getmethod = new GetMethod(url);
return httpRequest(getmethod);

}

public Response get(String url, PostParameter[] params, Paging paging)
throws WeiboException {
if (null != paging) {
List<PostParameter> pagingParams = new ArrayList<PostParameter>(4);
if (-1 != paging.getMaxId()) {
pagingParams.add(new PostParameter("max_id", String
.valueOf(paging.getMaxId())));
}
if (-1 != paging.getSinceId()) {
pagingParams.add(new PostParameter("since_id", String
.valueOf(paging.getSinceId())));
}
if (-1 != paging.getPage()) {
pagingParams.add(new PostParameter("page", String
.valueOf(paging.getPage())));
}
if (-1 != paging.getCount()) {
if (-1 != url.indexOf("search")) {
// search api takes "rpp"
pagingParams.add(new PostParameter("rpp", String
.valueOf(paging.getCount())));
} else {
pagingParams.add(new PostParameter("count", String
.valueOf(paging.getCount())));
}
}
PostParameter[] newparams = null;
PostParameter[] arrayPagingParams = pagingParams
.toArray(new PostParameter[pagingParams.size()]);
if (null != params) {
newparams = new PostParameter[params.length
+ pagingParams.size()];
System.arraycopy(params, 0, newparams, 0, params.length);
System.arraycopy(arrayPagingParams, 0, newparams,
params.length, pagingParams.size());
} else {
if (0 != arrayPagingParams.length) {
String encodedParams = HttpClient
.encodeParameters(arrayPagingParams);
if (-1 != url.indexOf("?")) {
url += "&" + encodedParams;
} else {
url += "?" + encodedParams;
}
}
}
return get(url, newparams);
} else {
return get(url, params);
}
}

/**
* 处理http deletemethod请求
*/

public Response delete(String url, PostParameter[] params)
throws WeiboException {
if (0 != params.length) {
String encodedParams = HttpClient.encodeParameters(params);
if (-1 == url.indexOf("?")) {
url += "?" + encodedParams;
} else {
url += "&" + encodedParams;
}
}
DeleteMethod deleteMethod = new DeleteMethod(url);
return httpRequest(deleteMethod);

}

/**
* 处理http post请求
*
*/

public Response post(String url, PostParameter[] params)
throws WeiboException {
return post(url, params, true);

}

public Response post(String url, PostParameter[] params,
Boolean WithTokenHeader) throws WeiboException {
log("Request:");
log("POST" + url);
PostMethod postMethod = new PostMethod(url);
for (int i = 0; i < params.length; i++) {
postMethod.addParameter(params[i].getName(), params[i].getValue());
}
HttpMethodParams param = postMethod.getParams();
param.setContentCharset("UTF-8");
if (WithTokenHeader) {
return httpRequest(postMethod);
} else {
return httpRequest(postMethod, WithTokenHeader);
}
}

/**
* 支持multipart方式上传图片
*
*/
public Response multPartURL(String url, PostParameter[] params,
ImageItem item) throws WeiboException {
PostMethod postMethod = new PostMethod(url);
try {
Part[] parts = null;
if (params == null) {
parts = new Part[1];
} else {
parts = new Part[params.length + 1];
}
if (params != null) {
int i = 0;
for (PostParameter entry : params) {
parts[i++] = new StringPart(entry.getName(),
(String) entry.getValue());
}
parts[parts.length - 1] = new ByteArrayPart(item.getContent(),
item.getName(), item.getContentType());
}
postMethod.setRequestEntity(new MultipartRequestEntity(parts,
postMethod.getParams()));
return httpRequest(postMethod);

} catch (Exception ex) {
throw new WeiboException(ex.getMessage(), ex, -1);
}
}

public Response multPartURL(String fileParamName, String url,
PostParameter[] params, File file, boolean authenticated)
throws WeiboException {
PostMethod postMethod = new PostMethod(url);
try {
Part[] parts = null;
if (params == null) {
parts = new Part[1];
} else {
parts = new Part[params.length + 1];
}
if (params != null) {
int i = 0;
for (PostParameter entry : params) {
parts[i++] = new StringPart(entry.getName(),
(String) entry.getValue());
}
}
FilePart filePart = new FilePart(fileParamName, file.getName(),
file, new MimetypesFileTypeMap().getContentType(file),
"UTF-8");
filePart.setTransferEncoding("binary");
parts[parts.length - 1] = filePart;

postMethod.setRequestEntity(new MultipartRequestEntity(parts,
postMethod.getParams()));
return httpRequest(postMethod);
} catch (Exception ex) {
throw new WeiboException(ex.getMessage(), ex, -1);
}
}

public Response httpRequest(HttpMethod method) throws WeiboException {
return httpRequest(method, true);
}