1）引入jar包

             
                 
      
       com.caucho
                  
      
       hessian
                  
      
       4.0.51
              
     

2）创建服务接口

1 import java.io.File; 2 import java.util.List; 3  4 public interface HelloSessian { 5  6     String sayHello(String name); 7      8     List
     
       getExams(); 9     10     File download(String path);11     12     String upload(File file);13 }
     

3）写实现类，其中对象要实现序列化接口，因为hessian传递的是二进制流

1 import java.io.File; 2 import java.util.ArrayList; 3 import java.util.Date; 4 import java.util.List; 5  6 public class HelloSessianImpl implements HelloSessian { 7  8     @Override 9     public String sayHello(String name) {10         return "Hello " + name;11     }12 13     @Override14     public List
     
       getExams() {15         List
      
        exams = new ArrayList<>();16         Exam e1 = new Exam();17         e1.setId(1001);18         e1.setName("yyq");19         e1.setStart(new Date());20         Exam e2 = new Exam();21         e2.setId(1002);22         e2.setName("lucy");23         e2.setStart(new Date());24         exams.add(e1);25         exams.add(e2);26         return exams;27     }28 29     @Override30     public File download(String path) {31         return new File(path);32     }33 34     @Override35     public String upload(File file) {36         String name = file.getName();37         return "Upload " + name + " ok!";38     }39 40 }
      
     

1 import java.io.Serializable; 2 import java.util.Date; 3  4 public class Exam implements Serializable { 5     /**serialVersionUID:(用一句话描述这个变量表示什么).  6      */   7     private static final long serialVersionUID = 1L; 8  9     private int id;10     private String name;11     private Date start;12     13     public int getId() {14         return id;15     }16 17     public void setId(int id) {18         this.id = id;19     }20 21     public String getName() {22         return name;23     }24 25     public void setName(String name) {26         this.name = name;27     }28 29     public Date getStart() {30         return start;31     }32 33     public void setStart(Date start) {34         this.start = start;35     }36 37     @Override38     public String toString() {39         return "Exam [id=" + id + ", name=" + name + ", start=" + start + "]";40     }41 }

4）配置servlet

1 
     
       2         
      
       hessian
       3         
      
       com.caucho.hessian.server.HessianServlet
       4         
      
        5             
       
        home-api
        6             
       
        henu.yyq.hessian.HelloSessian
        7         
       8         
      
        9             
       
        home-class
       10             
       
        henu.yyq.hessian.HelloSessianImpl
       11         
      12     
     13     
     
      14         
      
       hessian
      15         
      
       /hessian
      16     
     

5）部署并且启动tomcat，不解释

6）客户端调用

客户端引入jar包，记得版本要一致

写调用测试类

1 public static void main(String[] args) throws IOException { 2          3         HessianProxyFactory factory = new HessianProxyFactory(); 4         factory.setOverloadEnabled(true); 5         HelloSessian proxy = (HelloSessian) factory.create(HelloSessian.class, "http://localhost:8080/hessian"); 6         String ret = proxy.sayHello("test"); 7         System.out.println(ret); 8         List
     
       exams = proxy.getExams(); 9         for (Exam exam : exams) {10             System.out.println(exam.toString());11         }12         13         File download = proxy.download("d:/1.txt");14         System.out.println(download.getName());15         FileInputStream in = new FileInputStream(download);16         byte[] buf = new byte[1024];17         in.read(buf);18         System.out.println(new String(buf));19         in.close();20         21 //        proxy.upload(file)22     }
     

 结果：

Hello testExam [id=1001, name=yyq, start=Tue May 01 23:48:14 CST 2018]Exam [id=1002, name=lucy, start=Tue May 01 23:48:14 CST 2018]1.txt哈哈哈第二行