arcgis api for javascript中使用proxy.jsp

来源：互联网发布：审批软件编辑：程序博客网时间：2024/06/07 03:29

当我们使用arcgis api for javascript 查询arcgis服务时，如果查询的参数很长时，通过get方式提交会查询不到结果，因为get方式提交的参数有长度限制，需要通过代理的方式使用post提交。

arcgis 提供了一种解决方案就是proxy.jsp.

首先在项目页面js中引入 proxy.jsp：esriConfig.defaults.io.proxyUrl=http://servername:prot/arcgis_js_api/proxy.jsp 引入代理页面

esriConfig.defaults.io.alwaysUseProxy=true; 设置代理是否一直起作用

引入之后把proxy.jsp放入到项目中。

代理页面源码如下：

<%@page session="false"%><%@page import="java.net.*,java.io.*" %><%!String[] serverUrls = {  "http://servername:8399/arcgis/rest/services"//对什么服务起作用，可以配置多个用","分割。};try {  String reqUrl = request.getQueryString();  boolean allowed = false;  String token = null;  for(String surl : serverUrls) {    String[] stokens = surl.split("\\s*,\\s*");    if(reqUrl.toLowerCase().contains(stokens[0].toLowerCase())) {      allowed = true;      if(stokens.length >= 2 && stokens[1].length() > 0)        token = stokens[1];      break;    }  }  if(reqUrl.endsWith(".png")) allowed = true;  if(!allowed) {    response.setStatus(403);    return;  }  if(token != null) {    reqUrl = reqUrl + (reqUrl.indexOf("?") > -1 ? "&" : "?") + "token=" + token;  }  URL url = new URL(reqUrl);        HttpURLConnection con = (HttpURLConnection)url.openConnection();        con.setDoOutput(true);        con.setRequestMethod(request.getMethod());        if(request.getContentType() != null) {          con.setRequestProperty("Content-Type", request.getContentType());        }  con.setRequestProperty("Referer", request.getHeader("Referer"));        int clength = request.getContentLength();        if(clength > 0) {                con.setDoInput(true);                InputStream istream = request.getInputStream();                OutputStream os = con.getOutputStream();                final int length = 5000;          byte[] bytes = new byte[length];          int bytesRead = 0;          while ((bytesRead = istream.read(bytes, 0, length)) > 0) {            os.write(bytes, 0, bytesRead);          }        }  else {    con.setRequestMethod("GET");  }out.clear();out = pageContext.pushBody();OutputStream ostream = response.getOutputStream();response.setContentType(con.getContentType());InputStream in = con.getInputStream();final int length = 5000;byte[] bytes = new byte[length];int bytesRead = 0;while ((bytesRead = in.read(bytes, 0, length)) > 0) {ostream.write(bytes, 0, bytesRead);}} catch(Exception e) {response.setStatus(500);}%>