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Web backend development - petitionem responsionis

2024-07-12

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Tabula contentorum

Praefatio

quaeritur?

simplex parametri

originale modum

Ver via

Post petitionem processus garbled

Entity parametri

Simplex parametri

Parametri ens universa

Edit

ordinata collectio parametri

Ordinare parametri

Edit

Collectio parametri

date parametri

Edit

Json parametri

Edit

Transi json data

json ordinata

json object (POJO)

json collection (POJO)

Notice

iter parametri

Request iter destinata

@RequestMapping

Request parametri

responsio

@ResponseBody

Una responsio eventus

Praefatio

Petitio accipe petitio data

Responsio pone responsio data

BS architectura Pasco/Server, navigatoris/servatoris modus architecturae, cliens navigatro tantum indiget, et logicae applicatio ac notitia servo repositae sunt (Securus esse, mediocris experientia）

CS architectura Client/Server, client/server architecturae modus (Progressus et sustentatio molesta sunt, experientia autem bona est）

quaeritur?

simplex parametri

originale modum

Obtine manually per HttpServletRequest

  1. import jakarta.servlet.http.HttpServletRequest;
  2. import org.springframework.web.bind.annotation.RequestMapping;
  3. import org.springframework.web.bind.annotation.RestController;
  4.  
  5. @RestController
  6. public class RequestController {
  7.     @RequestMapping("/SimpleParam")
  8.     public String SimpleParam(HttpServletRequest request){  //返回的字符串类型是String
  9.         String name=request.getParameter("name");
  10.         String age=request.getParameter("age");  //通过这个方法得到字符串类型的
  11.         int age1=Integer.parseInt(age);  //将年龄进行类型转换
  12.         System.out.println(name+":"+age1);  //设置返回格式
  13.         return "OK";
  14.     }
  15. }

Ver via

Parametri simplices:Nomen parametri idem est ac formalis parametri variabilis nomen, Definiens formalem parametri significat accipiens parametri

  1. @RestController
  2. public class RequestController {
  3.     @RequestMapping("/SimpleParam")
  4.     public String SimpleParam(String name,Integer age){
  5.         System.out.println(name+":"+age);
  6.         return "OK";
  7.     }
  8. }

Nota quod domicilia tabellariorum hic sunt omniahttp://localhost:8080/SimpleParam?name=tom&age=10

Ambae petitiones praedictarum acquirunt. Cum postulatio postulatur, solum URL in TABELLARIUS intrare debes.http://localhost:8080/SimpleParam

Post petitionem processus garbled

Si characteres Sinenses sunt in cursore, notae interpolatae in curriculo apparebunt, colum in configuratione pone.

Colamentum telae continentis adde et characterem specificam pone

  1. public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
  2.     protected Class<?>[] getRootConfigClasses() {
  3.         return new Class[0];
  4.     }
  5. ​
  6.     protected Class<?>[] getServletConfigClasses() {
  7.         return new Class[]{SpringMvcConfig.class};
  8.     }
  9. ​
  10.     protected String[] getServletMappings() {
  11.         return new String[]{"/"};
  12.     }
  13.     //乱码处理
  14.     @Override
  15.     protected Filter[] getServletFilters() {
  16.         CharacterEncodingFilter filter = new CharacterEncodingFilter();
  17.         filter.setEncoding("UTF-8");
  18.         return new Filter[]{filter};//如果有多个过滤器，在这里用，隔开
  19.     }
  20. }

Nota hunc processum pro post.

Si modus parametri nomen non congruit petitioni parametri nomini, @RequestParam uti potes ad destinata perficienda.

  1. @RestController
  2. public class RequestController {
  3.     @RequestMapping("/SimpleParam")
  4.     public String SimpleParam(@RequestParam(name="name") String username, Integer age){  //引号中写的是请求参数名
  5.         System.out.println(username+":"+age);
  6.         return "OK";
  7.     }
  8. }

Debitum in defaltis @PequestParam ad verum, id significat rogationem parametri ferri debere attributum requiratur falsis opponi potest (Hoc modo nullus error referetur si eam transeas vel non)

Entity parametri

Simplex parametri

Nomen parametri postulatio eadem est ac parametri formalis nomen attributum, mox definio Pojo ad recipiendum.

  1. @RestController
  2. public class SimplePojo {
  3.     @RequestMapping("/SimpleParam1")
  4.     public String SimplePojo(user user) {
  5.         System.out.println(user);
  6.         return "yes";
  7.     }
  8. }
  1. public class user {
  2.     private String name;
  3.     private Integer age;
  4. //加getter和setter方法toString
  5. }

Hic est urlhttp://localhost:8080/SimpleParam1?name=cat&age=29

Parametri ens universa

Nomen parametri postulatio eadem est ac parametri formalis nomen attributum., recipere potes nestram pojo parametri attributi secundum obiecti hierarchiae relationem.

  1. public class user {
  2.     private String name;
  3.     private Integer age;
  4. private Address address;
  5. //加getter和setter和toString
  6. }
  1. public class Address {
  2.     private String province;
  3.     private String city;
  4. //加getter和setter还有toString
  5. }
  1. @RestController
  2. public class SimplePojo {
  3.     @RequestMapping("/ComplexParam1")
  4.     public String ComplexParam(user user) {
  5.         System.out.println(user);
  6.         return "yes";
  7.     }
  8. }

ordinata collectio parametri

Ordinare parametri

Nomen parametri postulatio eadem est ac nomen globi parametri formalis et multae sunt petitiones., Definias ordinata generis parametri formalis accipere parametri

  1. @RestController
  2. public class SimplePojo {
  3.     @RequestMapping("/arrayParam")
  4.     public String ArrayParam(String[] hobby) {//在这里建立一个数组，然后后面的名称和传入参数相同
  5.         System.out.println(Arrays.toString(hobby));
  6.         return "yes";
  7.     }
  8. }

Collectio parametri

Nomen parametri postulatio eadem est cum nomine collectionis parametri formalis et multae sunt rogationis ambitus.，@RequestParamBinding parametri necessitudo

  1. @RestController
  2. public class SimplePojo {
  3.     @RequestMapping("/listParam")
  4.     public String ArrayParam(@RequestParam List<String> hobby) {
  5.         System.out.println(hobby);
  6.         return "yes";
  7.     }
  8. }

date parametri

Usus @DateTimeFormat annotationem ad perficiendam date parametri forma conversionis

  1. @RestController
  2. public class SimplePojo {
  3.     @RequestMapping("/dateParam")
  4.     public String dateParam(@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")LocalDateTime updateTime) {
  5.         System.out.println(updateTime);
  6.         return "yes";
  7.     }
  8. }

  1. //日期参数    
  2. //使用@DateTimeFormat注解设置日期类型数据格式，默认格式yyyy/MM/dd   @RequestMapping("/dataParam")    
  3. @ResponseBody    
  4. public String dataParam(Date date,@DateTimeFormat(pattern="yyyy-MM-dd") Date date1, @DateTimeFormat(pattern="yyyy/MM/dd HH:mm:ss") Date date2){        
  5. System.out.println("参数传递 date ==> "+date);        
  6. System.out.println("参数传递 date1(yyyy-MM-dd) ==> "+date1);        
  7. System.out.println("参数传递 date2(yyyy/MM/dd HH:mm:ss) ==> "+date2);        
  8. return "{'module':'data param'}";    }
  9. }
  10. //@DateTimeFormat是形参注解，用在SpringMVC控制器方法形参前面，用于设定日期时间型数据格式//属性：pattern：日期时间格式字符串

Accipe test:

http://localhost:8080/springmvc_04_request_param/dataParam?date=2088/08/08&date1=2088-08-18&date2=2088/08/28 8:08:08

Json parametri

Json parametri clavem nomen idem est ac parametri formalis objecti attributi nomen.

  1. @RestController
  2. public class SimplePojo {
  3.     @RequestMapping("/jsonParam")
  4.     public String jsonParam(@RequestBody user user) {
  5.         System.out.println(user);
  6.         return "yes";
  7.     }
  8. }
  9. //user这和前面的复杂实体参数一样

Encapsulate json in user entitatis genere per @requestbody

Transi json data

Import coordinatas primum

  1. <dependency>
  2.   <groupId>com.fasterxml.jackson.core</groupId>
  3.   <artifactId>jackson-databind</artifactId>
  4.   <version>2.9.0</version>
  5. </dependency>

Admitte auxilium latae conversionis Json notitia

  1. @Configuration
  2. @ComponentScan("com.itheima.controller")
  3. //开启json数据类型自动转换
  4. @EnableWebMvc
  5. public class SpringMvcConfig {
  6. }
json ordinata
   
  1. //集合参数：json格式
  2.     //1.开启json数据格式的自动转换，在配置类中开启@EnableWebMvc
  3.     //2.使用@RequestBody注解将外部传递的json数组数据映射到形参的集合对象中作为数据
  4. //它用来将请求体所包含的数据传递给请求参数，此注解一个处理器方法只能使用一次
  5.     @RequestMapping("/listParamForJson")
  6.     @ResponseBody
  7.     public String listParamForJson(@RequestBody List<String> likes){
  8.         System.out.println("list common(json)参数传递 list ==> "+likes);
  9.         return "{'module':'list common for json param'}";
  10.     }
json object (POJO)
  1. //POJO参数：json格式
  2. //1.开启json数据格式的自动转换，在配置类中开启@EnableWebMvc
  3. //2.使用@RequestBody注解将外部传递的json数据映射到形参的实体类对象中，要求属性名称一一对应
  4. @RequestMapping("/pojoParamForJson")
  5. @ResponseBody
  6. public String pojoParamForJson(@RequestBody User user){
  7.     System.out.println("pojo(json)参数传递 user ==> "+user);
  8.     return "{'module':'pojo for json param'}";
  9. }

Faciens Get petitionem

  1. {
  2.     "name":"xixi",
  3.     "age":21,
  4.     "address":{
  5.         "provice":"taiyuan",
  6.         "city":"taiyuan"
  7.     }
  8. }
json collection (POJO)
  1. //集合参数：json格式
  2. //1.开启json数据格式的自动转换，在配置类中开启@EnableWebMvc
  3. //2.使用@RequestBody注解将外部传递的json数组数据映射到形参的保存实体类对象的集合对象中，要求属性名称一一对应
  4. @RequestMapping("/listPojoParamForJson")
  5. @ResponseBody
  6. public String listPojoParamForJson(@RequestBody List<User> list){
  7.     System.out.println("list pojo(json)参数传递 list ==> "+list);
  8.     return "{'module':'list pojo for json param'}";
  9. }

Faciens Get petitionem

  1. [{"name":"xixi","age":12},
  2. {"name":"haha","age":21}
  3. ]
Notice

iter parametri

Parametris directe transi per URL petitionem. Utere {...} ad cognoscendam viam parametri.

per viam parametri

  1. @RestController
  2. public class SimplePojo {
  3.     @RequestMapping("/path/{id}")
  4.     public String pathParam(@PathVariable Integer id) {
  5.         System.out.println(id);
  6.         return "yes";
  7.     }
  8. }

Domicilium probatum ab TABELLARIUS esthttp://localhost:8080/viam/1

Plures viam parametri

  1. @RestController
  2. public class SimplePojo {
  3.     @RequestMapping("/path/{id}/{name}")
  4.     public String pathParam(@PathVariable Integer id ,@PathVariable String name) {
  5.         System.out.println(id+":"+name);
  6.         return "yes";
  7.     }
  8. }

Domicilium probatum ab TABELLARIUS esthttp://localhost:8080/viam/1/cat

Request iter destinata

Quaeritur: Viae quae in evolutione petitae sunt diversae esse debent, sed si eae viae sunt, error affereturPone modulus nomen praeposita petitioni viam

@RequestMapping

Est methodus annotationis et classis annotationis

Pone eam supra modum definitionis SpringMVC moderatoris

Petentibus iter ad modum usus moderatoris, si modum moderatoris hodierni in classibus constituendum, petentibus accessum praepositionem iter

  1. @Controller
  2. //设置模块名作为请求路径的前缀
  3. @RequestMapping("/user")
  4. public class UserController {
  5.     //请求路径映射
  6.     @RequestMapping("/save")
  7.     @ResponseBody
  8.     public String save(){
  9.         System.out.println("user save ...");
  10.         return "{'module':'user save'}";
  11.     }
  12.     //请求路径映射
  13.     @RequestMapping("/delete")
  14.     @ResponseBody
  15.     public String delete(){
  16.         System.out.println("user delete ...");
  17.         return "{'module':'user delete'}";
  18.     }
  19. ​
  20. }

Possessiones: valorem (default): peto aditum iter.Aut accessum iter praepositionis

Request parametri

@RequestParam formalis est parametri annotationis, ante fontem SpringMVC moderatoris methodi definitio parametri sita, ligare relationem inter parametros petendi et methodi processus parametri.

Parametri: requiritur: an DefaultValue parametri requiratur: defalta valor parametri

responsio

@ResponseBody

Sunt methodi annotationes et annotationes classis

Sita in modum moderatoris / classis

Munus estResponde directe ad modum pretii reditus.

@RestController=@Controller+@ResponseBody

  1. @RestController
  2. public class ResponseController {
  3.     @RequestMapping("/hello")
  4.     public String hello(){
  5.         System.out.println("hello world");
  6.         return "hello world~";
  7.     }
  8.     @RequestMapping("/getAddr")
  9.     public Address getAddr(){
  10.         Address addr=new Address();
  11.         addr.setProvince("山西");
  12.         addr.setCity("太原");
  13.         return addr;
  14.     }
  15.     @RequestMapping("/listAddr")
  16.     public List<Address> ListAddr(){
  17.         List<Address> list=new ArrayList<>();
  18.         Address addr=new Address();
  19.         addr.setProvince("山西");
  20.         addr.setCity("太原");
  21.         Address addr2=new Address();
  22.         addr2.setProvince("山");
  23.         addr2.setCity("太");
  24.         list.add(addr);
  25.         list.add(addr2);
  26.         return list;
  27.     }
  28. }

In test est ingressus TABELLARIUShttp://localhost:8080/listAddrId est, alia similia

Utraque methodus extrinsecus exposita appellatur interfacies functionis (exempli gratia supra tres interfaces), et via est eorum aditus via.

Adversus problema est quod eventus responsionis sunt diversi, et finalis analysis consequentium molestior est, unde responsionis eventus adunari debent.

Una responsio eventus

  1. public class Result {
  2.     private Integer code;
  3.     private String msg;
  4.     private Object data;
  5. public Result(){
  6.  
  7. }
  8. public Result(Integer code,String msg,Object data){
  9.     this.code=code;
  10.     this.msg=msg;
  11.     this.data=data;
  12.  
  13. }
  14.     public Integer getCode() {
  15.         return code;
  16.     }
  17.  
  18.     public void setCode(Integer code) {
  19.         this.code = code;
  20.     }
  21.  
  22.     public String getMsg() {
  23.         return msg;
  24.     }
  25.  
  26.     public void setMsg(String msg) {
  27.         this.msg = msg;
  28.     }
  29.  
  30.     public Object getData() {
  31.         return data;
  32.     }
  33.  
  34.     public void setData(Object data) {
  35.         this.data = data;
  36.     }
  37.     public static Result success(Object data){
  38.     return new Result(1,"success",data);
  39.     }
  40.     public static Result success(){
  41.         return new Result(1,"success",null);
  42.     }
  43.     public static Result error(String msg){
  44.         return new Result(0,msg,null);
  45.     }
  46.     @Override
  47.     public String toString() {
  48.         return "Result{" +
  49.                 "code=" + code +
  50.                 ", msg='" + msg + ''' +
  51.                 ", data=" + data +
  52.                 '}';
  53.     }
  54. }
  1. @RestController
  2. public class ResponseController {
  3.     @RequestMapping("/hello")
  4.     public Result hello(){
  5.         System.out.println("hello world");
  6.         //return new Result(1,"success","hello world");
  7.         return Result.success("hello world~");//需要给前端传送数据
  8.     }
  9.     @RequestMapping("/getAddr")
  10.     public Result getAddr(){
  11.         Address addr=new Address();
  12.         addr.setProvince("山西");
  13.         addr.setCity("太原");
  14.         return Result.success(addr);
  15.     }
  16.     @RequestMapping("/listAddr")
  17.     public Result ListAddr(){
  18.         List<Address> list=new ArrayList<>();
  19.         Address addr=new Address();
  20.         addr.setProvince("山西");
  21.         addr.setCity("太原");
  22.         Address addr2=new Address();
  23.         addr2.setProvince("山");
  24.         addr2.setCity("太");
  25.         list.add(addr);
  26.         list.add(addr2);
  27.         return Result.success(list);
  28.     }
  29. }

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