使用httpclient实现post的表单模式请求

先建立两个request与response两个基类，用于存放请求与响应

import java.util.List;

public class HttpRequestParams {
	private String url;
	private List<BasicPostPara> params;
	
	public HttpRequestParams(String url, List<BasicPostPara> params) {
		super();
		this.url = url;
		this.params = params;
	}

	public String getUrl() {
		return url;
	}
	
	public void setUrl(String url) {
		this.url = url;
	}
	public List<BasicPostPara> getParams() {
		return params;
	}
	public void setParams(List<BasicPostPara> params) {
		this.params = params;
	}

	@Override
	public String toString() {
		return "HttpRequestParams [url=" + url + ", params=" + params.toString() + "]";
	}
	
}

public class HttpResponse {
	private int statusCode; 
	
	private String body;

	public int getStatusCode() {
		return statusCode;
	}

	public void setStatusCode(int statusCode) {
		this.statusCode = statusCode;
	}

	public String getBody() {
		return body;
	}

	public void setBody(String body) {
		this.body = body;
	}

	@Override
	public String toString() {
		return "HttpResponse [statusCode=" + statusCode + ", body=" + body + "]";
	}

}

其中request中的BasicPostPara用来存放post请求对应的参数

public class BasicPostPara {
	private String key;
	private String value;
	
	public BasicPostPara(String key, String value) {
		super();
		if (key == null) {
	        throw new IllegalArgumentException("Name may not be null");
	     }
		this.key = key;
		this.value = value;
	}

	public String getKey() {
		return key;
	}

	public String getValue() {
		return value;
	}

	@Override
	public String toString() {
		if (this.value == null) {
			return this.key;
		}
		return key + "=" + value;
	}
		
}

然后再编写http请求方法

public HttpResponse postPara(HttpRequestParams req) {
		HttpResponse res = new HttpResponse();
		try {
			HttpClient httpClient = new DefaultHttpClient();
			httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 2000);
	        httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 2000);
	        
	        HttpPost post = new HttpPost(req.getUrl());
	        for (String key : GlobalConfig.HEAD_FINAL_MAP.keySet()) {
				post.setHeader(key, GlobalConfig.HEAD_FINAL_MAP.get(key));
			}
	        
	        List<BasicNameValuePair> pairList = new ArrayList<BasicNameValuePair>(); 
	        
	        for (BasicPostPara postValue : req.getParams()) {
	        	pairList.add(new BasicNameValuePair(postValue.getKey(), postValue.getValue()));
			}
	        
	        post.setEntity(new UrlEncodedFormEntity(pairList, "utf-8")); 
	        
	        org.apache.http.HttpResponse httpResponse = httpClient.execute(post);
	        
	        int statusCode = httpResponse.getStatusLine().getStatusCode();
	        
	        if(HttpStatus.SC_OK != statusCode) {
	        	
	        	throw new HttpException(statusCode);
	        } else {
	        	res.setStatusCode(statusCode);
	        	res.setBody(EntityUtils.toString(httpResponse.getEntity()));
	        }
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return res;
	}

post.setHeader();可以设置头部，因为我的请求头部固定，所以通过static块写好了。

public static final Map<String,String> HEAD_FINAL_MAP ;
	static {
		HEAD_FINAL_MAP = new HashMap<String, String>();
		HEAD_FINAL_MAP.put("Content-Type", "application/json");
		HEAD_FINAL_MAP.put("Accept", "application/json");
	}