1）引入jar包
<!-- https://mvnrepository.com/artifact/com.caucho/hessian -->
<dependency>
<groupId>com.caucho</groupId>
<artifactId>hessian</artifactId>
<version>4.0.51</version>
</dependency>
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<Exam> 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 @Override
14 public List<Exam> getExams() {
15 List<Exam> 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 @Override
30 public File download(String path) {
31 return new File(path);
32 }
33
34 @Override
35 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 @Override
38 public String toString() {
39 return "Exam [id=" + id + ", name=" + name + ", start=" + start + "]";
40 }
41 }
View Code4）配置servlet
1 <servlet>
2 <servlet-name>hessian</servlet-name>
3 <servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>
4 <init-param>
5 <param-name>home-api</param-name>
6 <param-value>henu.yyq.hessian.HelloSessian</param-value>
7 </init-param>
8 <init-param>
9 <param-name>home-class</param-name>
10 <param-value>henu.yyq.hessian.HelloSessianImpl</param-value>
11 </init-param>
12 </servlet>
13 <servlet-mapping>
14 <servlet-name>hessian</servlet-name>
15 <url-pattern>/hessian</url-pattern>
16 </servlet-mapping>
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<Exam> 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 test
Exam [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