作为servlet容器的hi

hi-nginx-java是一个独立于java官方的servlet规范，它有能力把NGINX直接编成servlet容器服务器。换言之，无需安装tomcat等容器服务器，也无需使用nginx的反向代理功能，只需安装jdk8+和hi-nginx，就能进行java web开发工作，而且性能更好。

 

先看NGINX的配置文件部分:

hi_java_classpath "-Djava.class.path=.:/usr/local/nginx/java:/usr/local/nginx/java/hi-nginx-java.jar:/usr/local/nginx/java/jdemo.jar"location ~ \.java {   rewrite ^/(.*)\.java$ /$1 break;   hi_need_kvdb on;   hi_kvdb_size 50;   hi_kvdb_expires 5m;   hi_need_session on;   hi_need_headers on;   hi_need_cookies on;   hi_java_servlet hi/jdemo;   }

应用是jdemo.jar。hi-nginx需要调用的入口servlet是hi.jdemo，配置时用/斜杠代替.点。该类的实现如下：

package hi;import hi.servlet;import hi.route;import java.util.ArrayList;import java.util.Arrays;import java.util.HashMap;import java.util.regex.Matcher;public class jdemo implements hi.servlet { private static hi.route r = hi.route.get_instance(); public jdemo() {  jdemo.r.get("^/(hello|test)/?$", (hi.request req, hi.response res, Matcher m) -> {   this.do_hello(req, res);  });  jdemo.r.get("^/error/?$", (hi.request req, hi.response res, Matcher m) -> {   this.do_error(req, res);  });  jdemo.r.get("^/redirect/?$", (hi.request req, hi.response res, Matcher m) -> {   this.do_redirect(req, res);  });  jdemo.r.add(new ArrayList<String>(Arrays.asList("GET", "POST")), "^/form/?$",    (hi.request req, hi.response res, Matcher m) -> {     this.do_form(req, res);    });  jdemo.r.get("^/session/?$", (hi.request req, hi.response res, Matcher m) -> {   this.do_session(req, res);  });  jdemo.r.get("^/md5/?$", (hi.request req, hi.response res, Matcher m) -> {   this.do_md5(req, res);  }); } public void handler(hi.request req, hi.response res) {  jdemo.r.run(req, res); } private void do_hello(hi.request req, hi.response res) {  res.headers.get("Content-Type").set(0, "text/plain;charset=UTF-8");  res.status = 200;  res.content = "hello,world"; } private void do_error(hi.request req, hi.response res) {  res.headers.get("Content-Type").set(0, "text/plain;charset=UTF-8");  res.status = 404;  res.content = "404 Not found"; } private void do_redirect(hi.request req, hi.response res) {  res.status = 302;  ArrayList<String> h = new ArrayList<String>();  h.add("/hello.java");  res.headers.put("Location", h); } private void do_form(hi.request req, hi.response res) {  res.headers.get("Content-Type").set(0, "text/plain;charset=UTF-8");  res.status = 200;  StringBuilder buffer = new StringBuilder();  buffer.append("head data " + req.headers.size() + "\n");  buffer.append(this.do_foreach(req.headers));  buffer.append("\ncookie data " + req.cookies.size() + "\n");  buffer.append(this.do_foreach(req.cookies));  buffer.append("\nform data " + req.form.size() + "\n");  buffer.append(this.do_foreach(req.form));  buffer.append(String.format("\nclient= %s\nmethod= %s\nuser_agent= %s\nuri= %s\nparam= %s\n", req.client,    req.method, req.user_agent, req.uri, req.param));  res.content = buffer.toString(); } private void do_session(hi.request req, hi.response res) {  res.headers.get("Content-Type").set(0, "text/plain;charset=UTF-8");  res.status = 200;  String key = "test";  int value = 0;  if (req.session.containsKey(key)) {   value = Integer.parseInt(req.session.get(key)) + 1;  }  res.session.put(key, String.valueOf(value));  res.content = String.format("hello,%d", value);  res.status = 200; } private void do_md5(hi.request req, hi.response res) {  res.headers.get("Content-Type").set(0, "text/plain;charset=UTF-8");  String plaintext = "hello,md5!";  res.status = 200;  res.content = String.format("%s\nmd5= %s", plaintext, this.md5(plaintext)); } private String md5(String str) {  try {   java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");   byte[] array = md.digest(str.getBytes());   StringBuffer sb = new StringBuffer();   for (int i = 0; i < array.length; ++i) {    sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));   }   return sb.toString();  } catch (java.security.NoSuchAlgorithmException e) {  }  return null; } private String do_foreach(HashMap<String, String> m) {  StringBuffer buffer = new StringBuffer();  for (HashMap.Entry<String, String> item : m.entrySet()) {   buffer.append(String.format("%s\t=\t%s\n", item.getKey(), item.getValue()));  }  return buffer.toString(); }}

将其用javac和jar编译组装为jdemo.jar文件后，安装至/usr/local/nginx/java目录中。编写好上述nginx配置，restart或者reload nginx即可通过访 Flask框架的功能。如此，可大幅度省去tomcat应用发布时繁琐的配置过程，而且能够获得更好的应用性能。如果通过hi_need_cache开启LRU缓存，无论多短的缓存时间，哪怕仅仅1秒，也能使得应用获得近乎nginx静态文件服务一样的性能表现，并且不会想tomcat等服务器那样大幅度消耗cpu和内存。

 

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hi-nginx-java是一个独立于java官方的servlet规范，它有能力把NGINX直接编成servlet容器服务器。换言之，无需安装tomcat等容器服务器，也无需使用nginx的反向代理功能，只需安装jdk8+和hi-nginx，就能进行javaweb开发工作，而且性能更好。先看NGINX的配置文件部分:hi_java_classpath"-Djava.class.path=
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