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Java如何設(shè)置代理IP訪問網(wǎng)站
代理服務(wù)器(Proxy Server)是一種重要的服務(wù)器安全功能，它的工作主要在開放系統(tǒng)互聯(lián)(OSI)模型的會(huì)話層，從而起到防火墻的作用。下面小編準(zhǔn)備了關(guān)于Java如何設(shè)置代理IP訪問網(wǎng)站的文章，提供給大家參考!
1.源碼
import java.io.BufferedInputStream;
import java.net.URL;
import java.net.URLConnection;
public class TestProxyIp {
public static void main(String args){
//System.getProperties().setProperty("proxySet", "true"); //如果不設(shè)置，只要代理IP和代理端口正確,此項(xiàng)不設(shè)置也可以
System.getProperties().setProperty("http.proxyHost", "218.26.204.66");
System.getProperties().setProperty("http.proxyPort", "8080");
System.out.println(getHtml("http://www.ip138.com/ip2city.asp")); //判斷代理是否設(shè)置成功
}
private static String getHtml(String address){
StringBuffer html = new StringBuffer();
String result = null;
try{
URL url = new URL(address);
URLConnection conn = url.openConnection();
conn.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB5; .NET CLR 2.0.50727; CIBA)");
BufferedInputStream in = new BufferedInputStream(conn.getInputStream());
try {
String inputLine;
byte buf = new byte;
int bytesRead = 0;
while (bytesRead >= 0) {
inputLine = new String(buf, 0, bytesRead, "ISO-8859-1");
html.append(inputLine);
bytesRead = in.read(buf);
inputLine = null;
}
buf = null;
} finally {
in.close();
conn = null;
url = null;
}
result = new String(html.toString().trim().getBytes("ISO-8859-1"), "gb2312").toLowerCase();
}catch(Exception e){
e.printStackTrace();
return null;
}
html = null;
return result;
}
}
2.結(jié)果
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