JAVA方法中通过调用URL来获取其返回的内容

1. 先通过以下的方法获取URL连接返回的流信息：

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public String getReturnData(String urlString) throws UnsupportedEncodingException {

String res = "";

try {

URL url = new URL(urlString);

java.net.HttpURLConnection conn = (java.net.HttpURLConnection)url.openConnection();

conn.setDoOutput(true);

conn.setRequestMethod("POST");

java.io.BufferedReader in = new java.io.BufferedReader(new java.io.InputStreamReader(conn.getInputStream(),"UTF-8"));

String line;

while ((line = in.readLine()) != null) {

res += line;

}

in.close();

} catch (Exception e) {

logger.error("error in wapaction,and e is " + e.getMessage());

}

// System.out.println(res);

return res;

}

2. 通过以上方法获取流，可以在转化为对应的字符串，在页面显示，或者通过PrintWriter，在ACTION中直接返回内容：

(如果PrintWriter在页面中显示为乱码，则需要设置编码类型：response.setCharacterEncoding("utf-8");)

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/*设置消息返回格式*/

response.setCharacterEncoding("utf-8");

response.setHeader("Pragma","No-cache");

response.setHeader("Cache-Control","no-cache");

response.setDateHeader("Expires",0);

PrintWriter out = response.getWriter();

out.write(content);

out.flush();

out.close();