@RequestBody传递多个不同对象
如果使用spring mvc同客户端通信,完全使用json数据格式,需要增加RequestBody注解,函数参数为自定义类
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@Controller
public class TestController{
@RequestMapping ( "\test" )
@ResponseBody
public RetureResult test( @RequestBody User user){
return new ReturnResult();
}
}
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这样的话,可以将接收到的json格式的数据转换为指定的数据对象user。比如{name:"test"},name为User类的属性域。通过ResponseBody注解,可以返回json格式的数据。
有时接收json格式数据时,我们可能需要将其转换为多个对象。
以下方式是错误的。原因是request的content-body是以流的形式进行读取的,读取完一次后,便无法再次读取了。
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@Controller
public class TestController{
@RequestMapping ( "\test" )
@ResponseBody
public RetureResult test( @RequestBody User user, @RequestBody Address address){
return new ReturnResult();
}
}
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解决方案1
增加一个包装类,将所需要类写入,增加get,set方法
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@Controller
public class TestController{
@RequestMapping ( "\test" )
@ResponseBody
public RetureResult test( @RequestBody Param param){
User user=param.getUser();
Address address=param.getAddress();
return new ReturnResult();
}
}
class Param{
private User user;
private Address address;
public User getUser() {
return user;
}
public void setUser(User user) {
this .user = user;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this .address = address;
}
}
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此时传输的json数据格式变为{user:{name:"test"},address:{location:"新华路"}}。
由于只是在TestController中增加一个包装类,不会影响其他的类以及已经定义好的model类,因此可以非常方便的达到接收多个对象参数的目的。
解决方案2
将接收参数定义为Map<String, Object>,然后使用map转object工具,转换成需要的对象。
此时,即使自定义的Param类中的属性即使比json数据中的属性少了,也没关系。
其中JSONUtils为自定义的工具类,可使用常见的fastjson等工具包包装实现。
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@Controller
public class TestController{
@RequestMapping ( "\test" )
@ResponseBody
public Object test( @RequestBody Map<String, Object> models){
User user=JsonXMLUtils.map2object((Map<String, Object>)models.get( "user" ),User. class );
Address address=JsonXMLUtils.map2object((Map<String, Object>)models.get( "address" ),Address. class );
return models;
}
}
import com.alibaba.fastjson.JSON;
public class JsonXMLUtils {
public static String obj2json(Object obj) throws Exception {
return JSON.toJSONString(obj);
}
public static <T> T json2obj(String jsonStr, Class<T> clazz) throws Exception {
return JSON.parseObject(jsonStr, clazz);
}
public static <T> Map<String, Object> json2map(String jsonStr) throws Exception {
return JSON.parseObject(jsonStr, Map. class );
}
public static <T> T map2obj(Map<?, ?> map, Class<T> clazz) throws Exception {
return JSON.parseObject(JSON.toJSONString(map), clazz);
}
}
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使用多个@RequestBody接收参数
原因
常规情况下,因为request的body只能读取一次,@RequestBody也只能解析一次,这就导致解析第二个的@RequestBody的时候stream已经关闭了,无法再次读取。
话不多说,上货:
解决办法:两个类,直接copy即可
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import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
public class BodyReaderRequestWrapper extends HttpServletRequestWrapper {
private final String body;
/**
*
* @param request
*/
public BodyReaderRequestWrapper(HttpServletRequest request) throws IOException{
super (request);
StringBuilder sb = new StringBuilder();
InputStream ins = request.getInputStream();
BufferedReader isr = null ;
try {
if (ins != null ){
isr = new BufferedReader( new InputStreamReader(ins));
char [] charBuffer = new char [ 128 ];
int readCount = 0 ;
while ((readCount = isr.read(charBuffer)) != - 1 ){
sb.append(charBuffer, 0 ,readCount);
}
} else {
sb.append( "" );
}
} catch (IOException e){
throw e;
} finally {
if (isr != null ) {
isr.close();
}
}
sb.toString();
body = sb.toString();
}
@Override
public BufferedReader getReader() throws IOException {
return new BufferedReader( new InputStreamReader( this .getInputStream()));
}
@Override
public ServletInputStream getInputStream() throws IOException {
final ByteArrayInputStream byteArrayIns = new ByteArrayInputStream(body.getBytes());
ServletInputStream servletIns = new ServletInputStream() {
@Override
public boolean isFinished() {
return false ;
}
@Override
public boolean isReady() {
return false ;
}
@Override
public void setReadListener(ReadListener readListener) {
}
@Override
public int read() throws IOException {
return byteArrayIns.read();
}
};
return servletIns;
}
}
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import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Component
@WebFilter (filterName = "crownFilter" , urlPatterns = "/*" )
public class BodyReaderRequestFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest)req;
HttpServletResponse response = (HttpServletResponse)res;
BodyReaderRequestWrapper requestWrapper = new BodyReaderRequestWrapper(request);
if (requestWrapper == null ){
filterChain.doFilter(request,response);
} else {
filterChain.doFilter(requestWrapper,response);
}
}
@Override
public void destroy() {
}
}
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使用:自行测试。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/sunayn/article/details/106214391