Case in which Java is called by Node-javaTutorial-php.cn

Case in which Java is called by Node

黄舟

Release： 2017-09-21 09:36:28

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This article mainly introduces the sample code of Node calling Java. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let’s follow the editor to take a look.

The Java side serves as a service provider, implements services based on Dubbo and exposes services through Dubbo Hessian extension; the Node side acts as a service consumer, calling Java side services through node-hessian.

Java side

Service interface

package com.yuanxin.paas.ssb;
 
public interface TestService {
 
  /**
   * 测试：无参，无返回值。
   */
  void test();
   
  /**
   * 测试：原生类型参数与返回值。
   * 
   * @param i
   * @return 
   */
  String test0(int i);
   
  /**
   * 测试：无参，自定义类型返回值。
   * 
   * @return 
   */
  Result test1();
   
  /**
   * 测试：自定义类型参数，无返回值。
   * 
   * @param arg 
   */
  void test2(Arg arg);
   
  /**
   * 测试：自定义参数，自定义返回值。
   * 
   * @param arg
   * @return 
   */
  Result test3(final Arg arg);
}

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Custom parameter class

package com.yuanxin.paas.ssb;
 
import java.io.Serializable;
 
public class Arg implements Serializable {
 
  private int i;
 
  public int getI() {
    return i;
  }
 
  public void setI(int i) {
    this.i = i;
  }
 
}

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Custom return value class

package com.yuanxin.paas.ssb;
 
import java.io.Serializable;
 
public class Result implements Serializable {
 
  private int i;
 
  private String string;
 
  public int getI() {
    return i;
  }
 
  public void setI(int i) {
    this.i = i;
  }
 
  public String getString() {
    return string;
  }
 
  public void setString(String string) {
    this.string = string;
  }
 
}

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Dubbo configuration is omitted.

Node side

node-hessian

Install node-hessian:

npm install hessian-proxy

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Calling service interface

var Proxy = require(&#39;hessian-proxy&#39;).Proxy;
 
var proxy = new Proxy(&#39;http://127.0.0.1:9098/test-provider/provider/com.yuanxin.paas.ssb.TestService&#39;, &#39;&#39;, &#39;&#39;, proxy);
 
proxy.invoke(&#39;test&#39;, null, function (err, reply) {
  console.log(&#39;test: &#39; + reply);
});
 
proxy.invoke(&#39;test0&#39;, [25], function (err, reply) {
  console.log(&#39;test0: &#39; + JSON.stringify(reply));
})
 
proxy.invoke(&#39;test1&#39;, null, function (err, reply) {
  if (err) {
    console.log(&#39;test1: &#39; + err);
  }
 
  console.log(&#39;test1: &#39; + JSON.stringify(reply));
})
 
var argForTest2 = {
  i: 2
};
 
argForTest2.__type__ = &#39;com.yuanxin.paas.ssb.Arg&#39;;
 
proxy.invoke(&#39;test2&#39;, [argForTest2], function (err, reply) {
  if (err) {
    console.log(&#39;test2: &#39; + err);
  }
 
  console.log(&#39;test2: &#39; + JSON.stringify(reply));
})
 
 
var argForTest3 = {
  i: 3
};
 
argForTest3.__type__ = &#39;com.yuanxin.paas.ssb.Arg&#39;;
 
proxy.invoke(&#39;test3&#39;, [argForTest3], function (err, reply) {
  if (err) {
    console.log(&#39;test3: &#39; + err);
  }
 
  console.log(&#39;test3: &#39; + JSON.stringify(reply));
})

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Run result

Java side

Node side

Summary

Dubbo is very good and provides support for the Hessian native protocol; Node is also very simple to call, but there are still a few points that need to be noted:

Interface methods cannot be overloaded (methods in the interface must use different method names)
Custom type namespace server and consumer To be consistent (com.yuanxin.paas.ssb.Arg)
The server-side custom type needs to implement the serialization interface (java.io.Serializable)
Try to use simple custom type structures (avoid nesting)

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