ajax跨域请求使用代理
public class ProxyHandler extends HttpServlet {
private static final long serialVersionUID = 1L;
private static Logger logger = Logger.getLogger(ProxyHandler.class);
private static final String CHARSET_UTF8 = "UTF-8";
public static final String CONTENT_URL_NAME = "url";
public void init(ServletConfig config) throws ServletException {
super.init();
}
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
noSecurityRequest(req, resp);
}
private void noSecurityRequest(HttpServletRequest req, HttpServletResponse resp) throws IOException {
logger.info("ProxyHandler noSecurityRequest 请求类型: GET");
String url0 = "";
OutputStream out = null;
HttpURLConnection conn = null;
String requestContent = req.getContentType();
String requestCharset = req.getCharacterEncoding();
StringBuffer requestContentType = new StringBuffer();
if (requestContent != null) {
requestContentType.append(requestContent);
if (requestCharset != null) {
requestContentType.append(";charset=").append(requestCharset);
}
}
try {
url0 = req.getQueryString();
if (url0 != null)
url0 = URLDecoder.decode(url0, "UTF-8");
if (url0.startsWith("url=")) {
url0 = url0.substring(4);
}
if (url0.indexOf("requestTime") != -1) {
url0 = url0.split("requestTime")[0];
url0 = url0.substring(0, url0.length() - 1);
}
// 参数空格替换成%20
url0 = url0.replace(" ", "%20");
URL url = new URL(url0);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
if (!requestContentType.toString().equals("")) {
conn.setRequestProperty("Content-Type", requestContentType.toString());
}
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
String contentType = conn.getContentType();
String encoding = conn.getContentEncoding();
out = resp.getOutputStream();
resp.setContentType(contentType);
resp.setHeader("Content-Encoding", encoding);
BufferedInputStream in = new BufferedInputStream(conn.getInputStream());
out = resp.getOutputStream();
int len = 0;
byte[] b = new byte[1024];
while ((len = in.read(b)) > 0) {
out.write(b, 0, len);
}
out.flush();
logger.info("\n请求地址: " + url0 + "\n请求成功!");
} catch (Exception e) {
logger.error("请求地址: " + url0 + "\n请求失败: " + e);
try {
if (out != null) {
out.close();
}
if (conn != null)
conn.disconnect();
} catch (Exception e1) {
logger.error(e1);
}
try {
if (out != null) {
out.close();
}
if (conn != null)
conn.disconnect();
} catch (Exception e2) {
logger.error(e2);
}
} finally {
try {
if (out != null) {
out.close();
}
if (conn != null)
conn.disconnect();
} catch (Exception e) {
logger.error(e);
}
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
logger.info("请求类型: POST");
InputStream indoc = request.getInputStream();
String url0 = request.getQueryString();
if (url0 != null) {
url0 = URLDecoder.decode(url0, "UTF-8");
}
String requestContent = request.getContentType();
String requestCharset = request.getCharacterEncoding();
StringBuffer requestContentType = new StringBuffer();
if (requestContent != null) {
requestContentType.append(requestContent);
if (requestCharset != null) {
requestContentType.append(";charset=").append(requestCharset);
}
}
OutputStream out = response.getOutputStream();
try {
if (url0.startsWith("url=")) {
String urlString = url0.substring(4);
URL url = new URL(urlString);
BufferedInputStream in = null;
HttpURLConnection connection = null;
byte[] bs = (byte[]) null;
if (url != null) {
try {
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", requestContentType.toString());
connection.setDoInput(true);
connection.setDoOutput(true);
OutputStream toserver = connection.getOutputStream();
int l = 0;
while ((l = indoc.read()) != -1) {
toserver.write(l);
}
toserver.flush();
toserver.close();
String responseContentType = connection.getContentType();
String responseCharset = connection.getContentEncoding();
response.setContentType(responseContentType);
response.setCharacterEncoding(responseCharset);
in = new BufferedInputStream(connection.getInputStream());
bs = new byte[1024];
int startpos = 0;
int num = 0;
num = in.read(bs, startpos, 1024);
logger.info("返回信息:");
while (num != -1) {
out.write(bs, 0, num);
logger.info(new String(bs));
num = in.read(bs, 0, 1024);
}
logger.info("\n请求地址: " + url0 + "\n请求成功!");
} catch (IOException e) {
logger.info("\n请求地址: " + url0 + "\n请求成功!");
if (in != null)
try {
in.close();
} catch (Exception localException1) {
}
if (connection == null) {
if (in != null)
try {
in.close();
} catch (Exception localException2) {
}
if (connection != null) {
try {
connection.disconnect();
} catch (Exception localException3) {
}
}
if (out == null)
return;
out.flush();
out.close();
return;
}
try {
connection.disconnect();
} catch (Exception localException4) {
}
if (in != null)
try {
in.close();
} catch (Exception localException5) {
}
if (connection != null)
try {
connection.disconnect();
} catch (Exception localException6) {
}
} finally {
if (in != null)
try {
in.close();
} catch (Exception localException7) {
}
if (connection != null)
try {
connection.disconnect();
} catch (Exception localException8) {
}
}
try {
connection.disconnect();
} catch (Exception localException11) {
}
}
}
} catch (Exception e) {
logger.error(e);
} finally {
if (out != null) {
out.flush();
out.close();
}
}
}
}