openlayers3+Arcgis Server跨域问题 代理解决方式
目录
C#使用代理的方式
后台代码
<%@ WebHandler Language="C#" Class="OpenlayerProxy" %>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net;
using System.IO;
/// <summary>
/// openlayers的代理类
/// 处理跨域请求
/// </summary>
public class OpenlayerProxy : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
var request = context.Request;
var response = context.Response;
var url = request["url"];
if (string.IsNullOrEmpty(url)) return;
HttpWebRequest requestproxy = (HttpWebRequest)WebRequest.Create(url);
requestproxy.UserAgent = context.Request.UserAgent;
requestproxy.ContentType = context.Request.ContentType;
HttpWebResponse responseproxy = null;
Stream stream = null;
StreamReader reader = null;
try
{
responseproxy = (HttpWebResponse)requestproxy.GetResponse();
stream = responseproxy.GetResponseStream();
reader = new StreamReader(stream);
string text = reader.ReadToEnd();
response.Write(text);
}
catch (Exception ex)
{
response.Write("出错了："+ex.Message);
}
finally
{
if (reader != null) reader.Close();
if (stream != null) stream.Close();
if (responseproxy != null) responseproxy.Close();
}
}
public bool IsReusable
{
get
{
return false;
}
}
}前台调用形式
var url = "http://服务器ip:6080/arcgis/services/axVector/MapServer/WFSServer?service=WFS&ersion=1.0.0&request=GetFeature&outputFormat=gml2&srsname=EPSG:4544&typename=axVetor:流转项目";
this.lzxmLayer = new ol.layer.Vector({
source: new ol.source.Vector({
url: '/Handler/OpenlayerProxy.ashx?url=' + encodeURIComponent(url),
format: new ol.format.GML2(),
})
});JAVA使用代理的方法
工具类
package com.thinker.lqhd.controllers.cbjyq;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
public class HttpConnectionUtil {
// post请求
public static final String HTTP_POST = "POST";
// get请求
public static final String HTTP_GET = "GET";
// utf-8字符编码
public static final String CHARSET_UTF_8 = "utf-8";
// HTTP内容类型。如果未指定ContentType，默认为TEXT/HTML
public static final String CONTENT_TYPE_TEXT_HTML = "text/xml";
// HTTP内容类型。相当于form表单的形式，提交暑假
public static final String CONTENT_TYPE_FORM_URL = "application/x-www-form-urlencoded";
// 请求超时时间
public static final int SEND_REQUEST_TIME_OUT = 50000;
// 将读超时时间
public static final int READ_TIME_OUT = 50000;
/**
*
* @param requestType
* 请求类型
* @param urlStr
* 请求地址
* @param body
* 请求发送内容
* @return 返回内容
*/
public static String requestMethod(String requestType, String urlStr, String body,HttpServletResponse responce) {
// 是否有http正文提交
boolean isDoInput = false;
if (body != null && body.length() > 0)
isDoInput = true;
OutputStream outputStream = null;
OutputStreamWriter outputStreamWriter = null;
InputStream inputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader reader = null;
StringBuffer resultBuffer = new StringBuffer();
String tempLine = null;
try {
// 统一资源
URL url = new URL(urlStr);
// 连接类的父类，抽象类
URLConnection urlConnection = url.openConnection();
// http的连接类
HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
// 设置是否向httpUrlConnection输出，因为这个是post请求，参数要放在
// http正文内，因此需要设为true, 默认情况下是false;
if (isDoInput) {
httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestProperty("Content-Length", String.valueOf(body.length()));
}
// 设置是否从httpUrlConnection读入，默认情况下是true;
httpURLConnection.setDoInput(true);
// 设置一个指定的超时值（以毫秒为单位）
httpURLConnection.setConnectTimeout(SEND_REQUEST_TIME_OUT);
// 将读超时设置为指定的超时，以毫秒为单位。
httpURLConnection.setReadTimeout(READ_TIME_OUT);
// Post 请求不能使用缓存
httpURLConnection.setUseCaches(false);
// 设置字符编码
httpURLConnection.setRequestProperty("Accept-Charset", CHARSET_UTF_8);
// 设置内容类型
httpURLConnection.setRequestProperty("Content-Type", CONTENT_TYPE_FORM_URL);
// 设定请求的方法，默认是GET
httpURLConnection.setRequestMethod(requestType);
// 打开到此 URL 引用的资源的通信链接（如果尚未建立这样的连接）。
// 如果在已打开连接（此时 connected 字段的值为 true）的情况下调用 connect 方法，则忽略该调用。
httpURLConnection.connect();
if (isDoInput) {
outputStream = httpURLConnection.getOutputStream();
outputStreamWriter = new OutputStreamWriter(outputStream);
outputStreamWriter.write(body);
outputStreamWriter.flush();// 刷新
}
if (httpURLConnection.getResponseCode() >= 300) {
throw new Exception(
"HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
}
if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
inputStream = httpURLConnection.getInputStream();
outputStream = responce.getOutputStream();
int bufferSize = 4 * 4 * 1024;// same buffer size as in Jetty utils
// (2*8192)
byte[] buffer = new byte[bufferSize];
int read;
while ((read = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, read);
}
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {// 关闭流
try {
if (outputStreamWriter != null) {
outputStreamWriter.close();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if (outputStream != null) {
outputStream.close();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if (reader != null) {
reader.close();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if (inputStreamReader != null) {
inputStreamReader.close();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if (inputStream != null) {
inputStream.close();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return resultBuffer.toString();
}
/**
* 将map集合的键值对转化成：key1=value1&key2=value2 的形式
*
* @param parameterMap
* 需要转化的键值对集合
* @return 字符串
*/
public static String convertStringParamter(Map parameterMap) {
StringBuffer parameterBuffer = new StringBuffer();
if (parameterMap != null) {
Iterator iterator = parameterMap.keySet().iterator();
String key = null;
String value = null;
while (iterator.hasNext()) {
key = (String) iterator.next();
if (parameterMap.get(key) != null) {
value = (String) parameterMap.get(key);
} else {
value = "";
}
parameterBuffer.append(key).append("=").append(value);
if (iterator.hasNext()) {
parameterBuffer.append("&");
}
}
}
return parameterBuffer.toString();
}
}
控制器调用
/**
* 代理访问
* @throws ServletException
* @throws IOException
*/
public void proxyHost2() throws ServletException, IOException {
String query = null;
query = request.getParameter("targetURL");
HttpConnectionUtil.requestMethod(HttpConnectionUtil.HTTP_GET, query, "",response);
}前台js调用代码
var url = "http://服务器ip:6080/arcgis/services/axVector/MapServer/WFSServer?service=WFS&ersion=1.0.0&request=GetFeature&outputFormat=gml2&srsname=EPSG:4544&typename=axVetor:流转项目";
url = '/yzt/proxyHost2?targetURL=' + encodeURIComponent(url);
$.ajax({
type: "POST",
url: url,
dataType:"text",
success: function(data){
var features = new ol.format.GML2().readFeatures(data);
//处理自己的逻辑
}
}); 经过自己测试，代码都是可行的。
最后声明：以上代码均是很久前转载的，找不到原地址了，如果有看见的麻烦告知下。好加上原文连接。
ps: 想找到不用写代理类的方法，毕竟请求wfs带上filter的时候麻烦。
转载自：https://blog.csdn.net/mrjintao/article/details/78576884
