@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
@Controller
public class TestController{
@RequestMapping("\test")
@ResponseBody
public RetureResult test(@RequestBody User user){
return new ReturnResult();
}
}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。
@Controller
public class TestController{
@RequestMapping("\test")
@ResponseBody
public RetureResult test(@RequestBody User user,@RequestBody Address address){
return new ReturnResult();
}
}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
@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;
}
}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。
@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);
}
}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
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;
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;
}
}
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() {
}
}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编程网。
