Java代理Internet

Java代理Internet

2013年10月23日

23:14

Java HTTP Proxy Settings

OVERVIEW

For
local networks within an organization, access to the public-domain
Internet is often via a HTTP Proxy. This article talks about the HTTP
proxy settings for the Java environment. I did not find a good document
on the Web to describe these settings; Had to discover many of them by
trial-and-error. Hence this article.

KEYWORDS

HTTP
Proxy, Java Proxy Settings, Tomcat, Application Server, Servlets, HTTP
Proxy Authentication for Java, Java Application Proxy Settings

SCENARIO

• Your Java client runs
  on a machine on the Local network – Private LAN. The client could
  be a standalone application, or a servlet hosted on a web
  container like Tomcat


• Your code access an
  external resource using HTTP. For example, invoking an external
  Web Service.


• Your HTTP call needs
  to tunnel through the HTTP proxy (using SOCKS authentication).
  Even if authentication is not required, you would still need to
  configure the URL and the Port of your HTTP proxy.

SETTINGS

Use
one of the methods below for your JVM proxy settings. Try an alternate
method if any particular method does not work. In most cases, you should
not require any change the pre-compiled Java code for proxy settings.
JVM’s environment settings should be enough to fix this problem.

Command Line JVM Settings

The
proxy settings are given to the JVM via command line arguments:

$ java
-Dhttp.proxyHost=proxyhostURL
-Dhttp.proxyPort=proxyPortNumber
-Dhttp.proxyUser=someUserName
-Dhttp.proxyPassword=somePassword
javaClassToRun

Setting System Properties in Code

Add
the following lines in your Java code so that JVM uses the proxy to make
HTTP calls. This would, of course, require you to recompile your Java
source. (The other methods do not require any recompilation.):

System.getProperties().put("http.proxyHost",
"someProxyURL");
System.getProperties().put("http.proxyPort",
"someProxyPort");
System.getProperties().put("http.proxyUser",
"someUserName");
System.getProperties().put("http.proxyPassword",
"somePassword");

Don’t
hardcode the proxy settings in your source. Read these settings from a
configurable text file, so your users can configure them. You might also
need to set this property:

System.getProperties().put("proxySet",
"true");

Or

System.getProperties().put("http.proxySet",
"true");

Tomcat Settings:
catalina.properties

Append
these properties to the catalina.properties file in Tomcat:${CATALINA_OME}/conf/catalina.properties file:

http.proxyHost=yourProxyURL

http.proxyPort=yourProxyPort
http.proxyUser=yourUserName

http.proxyPassword=yourPassword

Tomcat Settings: catalina.bat

Add
all the parameters defined above in the ${CATALINA_HOME}/bin/catalina.bat (for
Windows) or ${CATALINA_HOME}/bin/catalina.bat (for
*nix):

JAVA_OPTS="-Dhttp.proxyHost=yourProxyURL
..."

(Each
option is seperated by spaces.)

来自
<http://i4t.org/2007/05/04/java-http-proxy-settings/>

来自为知笔记(Wiz)

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