使用 Spring 3 来创建 RESTful Web Services 400 请求报错 

				 <context-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/rest-context.xml </param-value> </context-param>

<!-- This listener will load other application context file in addition to rest-servlet.xml --> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener>

<servlet> <servlet-name>rest</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet>

<servlet-mapping> <servlet-name>rest</servlet-name> <url-pattern>/service/*</url-pattern> </servlet-mapping>

				 <context:component-scan base-package="dw.spring3.rest.controller" />

<!--To enable @RequestMapping process on type level and method level--> <bean class="org.springframework.web.servlet.mvc.annotation .DefaultAnnotationHandlerMapping" /> <bean class="org.springframework.web.servlet.mvc.annotation .AnnotationMethodHandlerAdapter" />

<!--Use JAXB OXM marshaller to marshall/unmarshall following class--> <bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller"> <property name="classesToBeBound"> <list> <value>dw.spring3.rest.bean.Employee</value> <value>dw.spring3.rest.bean.EmployeeList</value> </list> </property> </bean>

<bean id="employees" class= "org.springframework.web.servlet.view.xml.MarshallingView"> <constructor-arg ref="jaxbMarshaller" /> </bean>

<bean id="viewResolver" class= "org.springframework.web.servlet.view.BeanNameViewResolver" />

				 @Controller publicclass EmployeeController { @RequestMapping(method=RequestMethod.GET, value="/employee/{id}") public ModelAndView getEmployee(@PathVariable String id) { Employee e = employeeDS.get(Long.parseLong(id)); return new ModelAndView(XML_VIEW_NAME, "object", e); } }

				 @RequestMapping(method=RequestMethod.POST, value="/employee") public ModelAndView addEmployee(@RequestBody String body) { Source source = new StreamSource(new StringReader(body)); Employee e = (Employee) jaxb2Mashaller.unmarshal(source); employeeDS.add(e); return new ModelAndView(XML_VIEW_NAME, "object", e); }

@RequestMapping(method=RequestMethod.PUT, value="/employee/{id}") public ModelAndView updateEmployee(@RequestBody String body) { Source source = new StreamSource(new StringReader(body)); Employee e = (Employee) jaxb2Mashaller.unmarshal(source); employeeDS.update(e); return new ModelAndView(XML_VIEW_NAME, "object", e); }

@RequestMapping(method=RequestMethod.DELETE, value="/employee/{id}") public ModelAndView removeEmployee(@PathVariable String id) { employeeDS.remove(Long.parseLong(id)); List<Employee> employees = employeeDS.getAll(); EmployeeList list = new EmployeeList(employees); return new ModelAndView(XML_VIEW_NAME, "employees", list); }

<employee><id>3</id><name>guest</name></employee>

				 @RequestMapping(method=RequestMethod.GET, value="/employees") public ModelAndView getEmployees() { List<Employee> employees = employeeDS.getAll(); EmployeeList list = new EmployeeList(employees); return new ModelAndView(XML_VIEW_NAME, "employees", list); }

				 @XmlRootElement(name="employees") public	class EmployeeList { private int count; private List<Employee> employees;

<strong>public</strong> EmployeeList() {}

<strong>public</strong> EmployeeList(List<Employee> employees) {
	<strong>this</strong>.employees = employees;
	<strong>this</strong>.count = employees.size();
}

<strong>public</strong>
			<strong>int</strong> getCount() {
	<strong>return</strong> count;
}
<strong>public</strong>	<strong>void</strong> setCount(<strong>int</strong> count) {
	<strong>this</strong>.count = count;
}

@XmlElement(name="employee")
<strong>public</strong> List<Employee> getEmployees() {
	<strong>return</strong> employees;
}
<strong>public</strong>	<strong>void</strong> setEmployees(List<Employee> employees) {
	<strong>this</strong>.employees = employees;
}

}

				 <bean class="org.springframework.web.servlet.view .ContentNegotiatingViewResolver"> <property name="mediaTypes"> <map> <entry key="xml" value="application/xml"/> <entry key="html" value="text/html"/> </map> </property> <property name="viewResolvers"> <list> <bean class="org.springframework.web.servlet.view .BeanNameViewResolver"/> <bean class="org.springframework.web.servlet.view .UrlBasedViewResolver"> <property name="viewClass" value= "org.springframework.web.servlet.view.JstlView"/> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> </list> </property> </bean>

				 <table border=1> <thead><tr> <th>ID</th> <th>Name</th> <th>Email</th> </tr></thead> <c:forEach var="employee" items="${employees.employees}"> <tr> <td>${employee.id}</td> <td>${employee.name}</td> <td>${employee.email}</td> </tr> </c:forEach> </table>

curl –HAccept:application/xml http://localhost:8080/rest/service/employees

curl -X POST -HContent-type:application/xml --data "<employee><id>3</id><name>guest</name><email>guest@ibm.com</employee>" http://localhost:8080/rest/service/employee 

curl -X PUT -HContent-type:application/xml --data "<employee><id>3</id><name>guest3</name><email>guest3@ibm.com</employee>" http://localhost:8080/rest/service/employee/3