SpringBoot的基本使用(一)

最新推荐文章于 2024-06-24 15:42:47 发布

cdcdec

最新推荐文章于 2024-06-24 15:42:47 发布

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分类专栏： java 文章标签： java SpringBoot idea

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SpringBoot的基本使用(一)

环境

InteilliJ IDEA ULTIMATE 2018.1, Gradle.

idea专业版安装

http://idea.lanyus.com/，在页面右上部，点击“使用帮助”，根据页面http://idea.lanyus.com/help/help.html中的破解补丁激活条目下的内容进行激活:

下载idea专业版zip版
下载 http://idea.lanyus.com/jar/JetbrainsCrack-2.6.2.jar 并将 JetbrainsCrack-2.6.2.jar 放置到 D盘根目录。
在 IntelliJ IDEA 安装目录中找到 idea.exe.vmoptions 和 idea64.exe.vmoptions ，以文本格式打开并同时在两个文件最后追加 -javaagent:D:/JetbrainsCrack-2.6.2.jar。
将系统时间需改为一个比较远的时间，如2050年.

启动 IntelliJ IDEA , 输入如下激活码激活(激活码中内容可修改)。

ThisCrackLicenseId-{
"licenseId":"ThisCrackLicenseId",
"licenseeName":"Rover12421",
"assigneeName":"",
"assigneeEmail":"rover12421@163.com",
"licenseRestriction":"For Rover12421 Crack, Only Test! Please support genuine!!!",
"checkConcurrentUse":false,
"products":[
{"code":"II","paidUpTo":"2099-12-31"},
{"code":"DM","paidUpTo":"2099-12-31"},
{"code":"AC","paidUpTo":"2099-12-31"},
{"code":"RS0","paidUpTo":"2099-12-31"},
{"code":"WS","paidUpTo":"2099-12-31"},
{"code":"DPN","paidUpTo":"2099-12-31"},
{"code":"RC","paidUpTo":"2099-12-31"},
{"code":"PS","paidUpTo":"2099-12-31"},
{"code":"DC","paidUpTo":"2099-12-31"},
{"code":"RM","paidUpTo":"2099-12-31"},
{"code":"CL","paidUpTo":"2099-12-31"},
{"code":"PC","paidUpTo":"2099-12-31"}
],
"hash":"2911276/0",
"gracePeriodDays":7,
"autoProlongated":false}

安装 IntelliJ IDEA ，安装后选择试用，全部步骤完毕并关闭 IntelliJ IDEA 后，将系统时间修改回来。

配置jdk,sdk

welcome to Intellij IDEA —>Config—>project Defaults–>Project Structure—>在弹出界面的左侧选中SDKs，在右侧点击“+”，选择JDK或Android SDK，进行配置。

新建springBoot gradle 项目

File->New->Project –>左侧选择 Spring Initializr—>右侧选择sdk版本 ->next
输入Group,Artifact名称，选择Type类型为Gradle
给Spring选择依赖,web必须选，其它根据需要。
完成,Run Application，运行项目

build.gradle文件设置

buildscript {
    ext {
        springBootVersion = '2.0.3.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'

group = 'com.cdcweb'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    compile('org.springframework.boot:spring-boot-starter-web')
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

文件目录

src/main/java , resources
ApiApplication.java:程序入口类，src/main/java/com/cdcweb/api/ApiApplication.java
com.cdcweb.bean 实体类
com.cdcweb.personapis Controller类
src/main/resources/static
src/main/resources/templates
src/main/resources/application.properites 配置文件

主要文件内容

ApiApplication.java

package com.cdcweb.api;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ApiApplication {
    public static void main(String[] args) {
        SpringApplication.run(ApiApplication.class, args);
    }
}

PersonApis.java

package com.cdcweb.api.personapis;
import com.cdcweb.api.bean.FileResult;
import com.cdcweb.api.bean.Person;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.util.*;
@RestController
public class PersonApis {
    /**
     * http://ip:8084/api/person/123
     *
     * @param id
     * @return
     */
    @RequestMapping(value = "/person/{id}", method = {RequestMethod.GET, RequestMethod.POST})
    public Person after(@PathVariable("id") Integer id) {
        id = id > 4 || id < 0 ? 0 : id;
        return PersonTools.initPersons().get(id);
    }

    /**
     * http://ip:8084/api/100/person
     *
     * @param id
     * @return
     */
    @RequestMapping(value = "/{id}/person", method = {RequestMethod.GET, RequestMethod.POST})
    public Person before(@PathVariable("id") Integer id) {
        id = id > 4 || id < 0 ? 0 : id;
        return PersonTools.initPersons().get(id);
    }

    /**
     * http://ip:8084/api/100/personList
     *
     * @return
     */
    @RequestMapping(value = "/personList", method = {RequestMethod.GET, RequestMethod.POST})
    public Map<Integer, Person> persons() {
        return PersonTools.initPersons();
    }

    /**
     * http://192.168.0.164:8084/api/person?id=90&name=kkk
     * 使用postman测试时   需要设置x-www-form-urlencoded类型才能正确返回。
     *
     * @param id
     * @param name
     * @return
     */
    @RequestMapping(value = "/person", method = {RequestMethod.GET, RequestMethod.POST})
    public Person origin(@RequestParam(value = "id", required = true, defaultValue = "0") Integer id, @RequestParam(value = "name", required = true, defaultValue = "cdc") String name) {
        id = id > 4 || id < 0 ? 0 : id;
        Person person = PersonTools.initPersons().get(id);
        person.setName(name);
        return person;
    }

    /**
     * http://ip:8084/api/upPerson
     * 上传json数据 并返回json数据
     * <p>
     * Content-Type
     * application/json
     *
     * @param person
     * @return
     */
    @RequestMapping(value = "/upPerson", method = RequestMethod.POST)
    @ResponseBody
    public Person person(@RequestBody Person person) {
        person.setCurrentdate(new Date().toString());
        return person;
    }

    /**
     * http://ip:8084/api/singleFileParams
     * 文件上传具体实现方法（单文件上传）
     * 使用postman测试时 选择form-data  不手动添加content-type
     * <p>
     * 否则会报the request was rejected because no multipart boundary was found错误
     *
     * @param file
     * @return
     */
    @RequestMapping(value = "/singleFileParams", method = RequestMethod.POST)
    @ResponseBody
    public FileResult singleFileParams(@RequestParam("file") MultipartFile file, @RequestParam("name") String name, @RequestParam("id") Integer id) {
        FileResult fileResult=null;
        List<String> fileLists=new ArrayList<>();
        if (!file.isEmpty()) {
            doSingleFile(file,fileLists);
            String str="['name:'"+name+",id:"+id+"]";
            fileResult = new FileResult(fileLists, str, FileResult.Result.SUCCESS);
            return fileResult;
        } else {
            fileResult=new FileResult(FileResult.Result.ERROR,"没有上传文件");
            return fileResult;
        }
    }

    /**
     * http://ip:8084/api/singleFile
     * 文件上传具体实现方法（单文件上传）
     * 使用postman测试时 选择form-data  不手动添加content-type
     * <p>
     * 否则会报the request was rejected because no multipart boundary was found错误
     */
    @RequestMapping(value = "/singleFile", method = RequestMethod.POST)
    @ResponseBody
    public FileResult singleFile(@RequestParam("file") MultipartFile file) {
        FileResult fileResult = null;
        List<String> fileLists = new ArrayList<>();
        if (!file.isEmpty()) {
            doSingleFile(file,fileLists);
            fileResult = new FileResult(fileLists, "[]", FileResult.Result.SUCCESS);
            return fileResult;
        } else {
            fileResult = new FileResult(FileResult.Result.ERROR, "没有上传文件");
            return fileResult;
        }
    }

    private FileResult doSingleFile(MultipartFile file,List<String> fileLists){
        FileResult fileResult=null;
        try {
            String fileName = file.getOriginalFilename();
            //文件后缀
            String suffix = fileName.substring(fileName.lastIndexOf("."), fileName.length());
            String prefix = fileName.substring(0, fileName.lastIndexOf("."));
            fileName = prefix + "_" + UUID.randomUUID() + suffix;
            fileLists.add(fileName);
            // 这里只是简单例子，文件直接输出到项目路径下。
            // 实际项目中，文件需要输出到指定位置，需要在增加代码处理。
            // 还有关于文件格式限制、文件大小限制
            BufferedOutputStream out = new BufferedOutputStream(
                    new FileOutputStream(new File(createParentFile(), fileName)));
            out.write(file.getBytes());
            out.flush();
            out.close();
        } catch (FileNotFoundException e) {
            fileResult = new FileResult(FileResult.Result.ERROR, e.getLocalizedMessage());
            return fileResult;
        } catch (IOException e) {
            fileResult = new FileResult(FileResult.Result.ERROR, e.getLocalizedMessage());
            return fileResult;
        }
        return fileResult;

    }

    /**
     * http://ip:8084/api/files
     * 多文件上传 主要是使用了MultipartHttpServletRequest和MultipartFile
     * @param request
     * @return
     */
    @RequestMapping(value = "/files", method = RequestMethod.POST)
    public @ResponseBody FileResult uploads(HttpServletRequest request) {
        FileResult fileResult=null;
        List<String> fileLists=new ArrayList<>();
        List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
        String name=request.getParameter("name");
        String id=request.getParameter("id");
        MultipartFile file = null;
        BufferedOutputStream stream = null;
        for (int i = 0; i < files.size(); ++i) {
            file = files.get(i);
            if (!file.isEmpty()) {
                try {
                    String Fname=file.getOriginalFilename();
                    //文件后缀
                    String suffix=Fname.substring(Fname.lastIndexOf("."), Fname.length());
                    String prefix=Fname.substring(0, Fname.lastIndexOf("."));
                    Fname=prefix+"_"+UUID.randomUUID()+suffix;
                    fileLists.add(Fname);
                    byte[] bytes = file.getBytes();
                    stream = new BufferedOutputStream(new FileOutputStream(new File(createParentFile(),Fname)));
                    stream.write(bytes);
                    stream.close();
                } catch (Exception e) {
                    fileResult=new FileResult(FileResult.Result.ERROR,e.getLocalizedMessage());
                    return fileResult;
                }
            } else {
                fileResult=new FileResult(FileResult.Result.ERROR,"没有上传文件");
                return fileResult;
            }
        }
        String str="";
        if((name==null || id==null)){
            str="[]";
        }else{
            str="['name:'"+name+",id:"+id+"]";
        }
        fileResult=new FileResult(fileLists,str,FileResult.Result.SUCCESS);
        return fileResult;
    }

    private File createParentFile() {
        File file = new File("e:/sptapi/upload/");
        if (!file.exists() || !file.isDirectory()) {
            file.mkdirs();
        }
        return file;
    }
}

application.properties

server.port=8089
server.servlet.context-path=/api

#上传文件大小的设置
spring.servlet.multipart.max-file-size=1024Mb
spring.servlet.multipart.max-request-size=1024Mb

SpringBoot 启动报错, has no explicit mapping for /error

SpringBoot 启动报错：This application has no explicit mapping for /error, so you are seeing this as a fallback.



Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sat Jun 23 19:10:18 CST 2018

There was an unexpected error (type=Not Found, status=404).

No message available



原因是【Application启动类放的位置不对】要将Application放在最外层，也就是要包含所有子包。

比如你的groupId是com.cdcweb,子包就是所谓的com.cdcweb.xxx,所以要将Application放在com.cdcweb包下。

请参考以下结论：spring-boot会自动加载启动类所在包下及其子包下的所有组件.