互联网P2P金融项目
互联网P2P金融项目架构搭建
互联网P2P金融项目业务功能
HttpClient使用
参看httpclient项目代码
Java原生API
代码实现
/**
* GET请求
* @param httpUrl
* @return
*/
public static String doGet(String httpUrl) {
HttpURLConnection connection = null;
InputStream is = null;
BufferedReader br = null;
String result = null;//返回结果字符串
try {
//创建远程url连接对象
URL url = new URL(httpUrl);
//通过远程url连接对象打开一个连接，强转成httpURLConnection类
connection = (HttpURLConnection) url.openConnection();
//设置连接方式：get
connection.setRequestMethod("GET");
//设置连接主机服务器的超时时间：15000毫秒
connection.setConnectTimeout(15000);
//设置读取远程返回的数据时间：60000毫秒
connection.setReadTimeout(60000);
//通过connection连接，获取输入流
is = connection.getInputStream();
//封装输入流is，并指定字符集
br = new BufferedReader(new InputStreamReader(is,"UTF-8"));
//存放数据
StringBuffer sbf = new StringBuffer();
String temp = null;
while ((temp = br.readLine()) != null) {
sbf.append(temp);
sbf.append("\r\n");//回车+换行
}
result = sbf.toString();
} catch (Exception e) {
e.printStackTrace();
} finally {
//关闭资源
if(null != br) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(null != is) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
connection.disconnect();//关闭远程连接
}
return result;
}
/**
* POST 请求
* @param httpUrl
* @param param
* @return
*/
public static String doPost(String httpUrl, String param) {
HttpURLConnection connection = null;
InputStream is = null;
OutputStream os = null;
BufferedReader br = null;
String result = null;
try {
//创建远程url连接对象
URL url = new URL(httpUrl);
//通过远程url连接对象打开连接
connection = (HttpURLConnection) url.openConnection();
//设置连接请求方式
connection.setRequestMethod("POST");
//设置连接主机服务器超时时间：15000毫秒
connection.setConnectTimeout(15000);
//设置读取主机服务器返回数据超时时间：60000毫秒
connection.setReadTimeout(60000);
//默认值为：false，当向远程服务器传送数据/写数据时，需要设置为true
connection.setDoOutput(true);
//默认值为：true，当前向远程服务读取数据时，设置为true，该参数可有可无
connection.setDoInput(true);
//通过连接对象获取一个输出流
os = connection.getOutputStream();
//通过输出流对象将参数写出去/传输出去,它是通过字节数组写出的
os.write(param.getBytes());//把需要传送的参数发送给远程url
//通过连接对象获取一个输入流，向远程读取
is = connection.getInputStream();
//对输入流对象进行包装
br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
StringBuffer sbf = new StringBuffer();
String temp = null;
//循环遍历一行一行读取数据
while ((temp = br.readLine()) != null) {
sbf.append(temp);
sbf.append("\r\n");
}
result = sbf.toString();
} catch (Exception e) {
e.printStackTrace();
} finally {
//关闭资源
if(null != br) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(null != os) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(null != is) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
//断开与远程地址url的连接
connection.disconnect();
}
return result;
}
HttpClient 3.1
⒈ 添加依赖
<!-- httpclient3.1版本 -->
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.1</version>
</dependency>
⒉ 代码实现
/**
* GET 请求方法
* 注：如果需要传递参数，把参数拼接在url地址后面
* @param url
*/
public static String doGet(String url) {
//输入流
InputStream is = null;
BufferedReader br = null;
String result = null;
//创建httpClient实例
HttpClient httpClient = new HttpClient();
//设置http连接主机服务超时时间：15000毫秒
//先获取连接管理器对象，再获取参数对象,再进行参数的赋值
httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(15000);
//创建一个Get方法实例对象
GetMethod getMethod = new GetMethod(url);
//设置get请求超时为60000毫秒
getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 60000);
//设置请求重试机制，默认重试次数：3次，参数设置为true，重试机制可用，false相反
getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(1, true));
try {
//执行Get方法
int statusCode = httpClient.executeMethod(getMethod);
//判断返回码
if(statusCode != HttpStatus.SC_OK) {
//如果状态码返回的不是ok,说明失败了,打印错误信息
System.err.println("Method faild: " + getMethod.getStatusLine());
}
//通过getMethod实例，获取远程的一个输入流
is = getMethod.getResponseBodyAsStream();
//包装输入流
br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
StringBuffer sbf = new StringBuffer();
//读取封装的输入流
String temp = null;
while ((temp = br.readLine()) != null) {
sbf.append(temp).append("\r\n");
}
result = sbf.toString();
} catch (Exception e) {
System.err.println("Fatal protocol violation: " + e.getMessage());
e.printStackTrace();
} finally {
//关闭资源
if(null != br) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(null != is) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
//释放连接
getMethod.releaseConnection();
}
return result;
}
/**
* POST 请求方法
* @param url
* @param paramMap
* @return
* @throws UnsupportedEncodingException
*/
public static String doPost(String url, Map<String,Object> paramMap) throws UnsupportedEncodingException {
//获取输入流
InputStream is = null;
BufferedReader br = null;
String result = null;
//创建httpClient实例对象
HttpClient httpClient = new HttpClient();
//设置httpClient连接主机服务器超时时间：15000毫秒
httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(15000);
//创建post请求方法实例对象
PostMethod postMethod = new PostMethod(url);
//设置post请求超时时间
postMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 60000);
NameValuePair[] nvp = null;
//判断参数map集合paramMap是否为空
if(null != paramMap && paramMap.size() > 0) {//不为空
//创建键值参数对象数组，大小为参数的个数
nvp = new NameValuePair[paramMap.size()];
//循环遍历参数集合map
Set<Entry<String, Object>> entrySet = paramMap.entrySet();
//获取迭代器
Iterator<Entry<String, Object>> iterator = entrySet.iterator();
int index = 0;
while(iterator.hasNext()) {
Entry<String, Object> mapEntry = iterator.next();
//从mapEntry中获取key和value创建键值对象存放到数组中
nvp[index] = new NameValuePair(mapEntry.getKey(), new String(mapEntry.getValue().toString().getBytes("UTF-8"),"UTF-8"));
index++;
}
}
//判断nvp数组是否为空
if(null != nvp && nvp.length > 0) {
//将参数存放到requestBody对象中
postMethod.setRequestBody(nvp);
}
try {
//执行POST方法
int statusCode = httpClient.executeMethod(postMethod);
//判断是否成功
if(statusCode != HttpStatus.SC_OK) {
System.err.println("Method faild: " + postMethod.getStatusLine());
}
//获取远程返回的数据
is = postMethod.getResponseBodyAsStream();
//封装输入流
br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
StringBuffer sbf = new StringBuffer();
String temp = null;
while ((temp = br.readLine()) != null) {
sbf.append(temp).append("\r\n");
}
result = sbf.toString();
} catch (Exception e) {
System.err.println("Fatal protocol violation: " + e.getMessage());
e.printStackTrace();
} finally {
//关闭资源
if(null != br) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(null != is) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
//释放连接
postMethod.releaseConnection();
}
return result;
}
HttpClient 4.5
⒈ 添加依赖
<!-- httpclient4.5版本 -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.3</version>
</dependency>
⒉ 代码实现
/**
* Get 请求方法
*
* @param url
* @return
*/
public static String doGet(String url) {
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
String result = "";
try {
//通过址默认配置创建一个httpClient实例
httpClient = HttpClients.createDefault();
//创建httpGet远程连接实例
HttpGet httpGet = new HttpGet(url);
//设置配置请求参数
RequestConfig requestConfig = RequestConfig.custom()
.setConnectTimeout(35000)//连接主机服务超时时间
.setConnectionRequestTimeout(35000)//请求超时时间
.setSocketTimeout(60000)//数据读取超时时间
.build();
//为httpGet实例设置配置
httpGet.setConfig(requestConfig);
//执行get请求得到返回对象
response = httpClient.execute(httpGet);
//通过返回对象获取返回数据
HttpEntity entity = response.getEntity();
//通过EntityUtils中的toString方法将结果转换为字符串
result = EntityUtils.toString(entity);
} catch (Exception e) {
e.printStackTrace();
} finally {
//关闭资源
if (null != response) {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != httpClient) {
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return result;
}
public static String doPost(String url, Map<String, Object> paramMap) {
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
String result = "";
try {
//创建httpClient实例
httpClient = HttpClients.createDefault();
//创建httpPost远程连接实例
HttpPost httpPost = new HttpPost(url);
//配置请求参数实例
RequestConfig requestConfig = RequestConfig.custom()
.setConnectTimeout(35000)//设置连接主机服务超时时间
.setConnectionRequestTimeout(35000)//设置连接请求超时时间
.setSocketTimeout(60000)//设置读取数据连接超时时间
.build();
//为httpPost实例设置配置
httpPost.setConfig(requestConfig);
//封装post请求参数
if (null != paramMap && paramMap.size() > 0) {
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
//通过map集成entrySet方法获取entity
Set<Entry<String, Object>> entrySet = paramMap.entrySet();
//循环遍历，获取迭代器
Iterator<Entry<String, Object>> iterator = entrySet.iterator();
while (iterator.hasNext()) {
Entry<String, Object> mapEntry = iterator.next();
nvps.add(new BasicNameValuePair(mapEntry.getKey(), mapEntry.getValue().toString()));
}
//为httpPost设置封装好的请求参数
httpPost.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8"));
}
//执行post请求得到返回对象
response = httpClient.execute(httpPost);
//通过返回对象获取数据
HttpEntity entity = response.getEntity();
//将返回的数据转换为字符串
result = EntityUtils.toString(entity);
} catch (Exception e) {
e.printStackTrace();
} finally {
//关闭资源
if (null != response) {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != httpClient) {
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return result;
}
