项目中遇到的问题

1：Eclipse 一直不停 building workspace… 解决办法

先将项目clean
然后把Maven Project Builder禁用掉就OK了。
在项目右键点击->Properties->Builder->Maven Project Builder取消勾选就可以了。其他保持不变

2：web.xml is missing and is set to true

这时候需要右击项目——>Java EE Tools——>Generate Deployment Descriptor Stub.然后系统会在src/main/webapp/WEB_INF文件加下创建web.xml文件。错误解决！

3 ：执行clean tomcat7:run命令报错：

 Could not find artifact com.taotao:taotao-parent:pom:0.0.1-SNAPSHOT and 'parent.relativePath' points at wrong local POM @ line 3, column 11

原因：在本地仓库找不到父工程taotao-parent，先将父工程发布到本地仓库。

4:Unknown return value type [java.lang.Integer]


后台和前台都可以正常执行，但是不会打印删除成功

原因：前台接受的是json格式的数据，但是后台传递的是int型数据

5：

错误显示

原因：

@RequestMapping(“/toSaveType”)有两个相同的

6:今天做mybatis与spring整合的时候报了一个错误

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in file [D:\soft\eclipseMars\workspace\taotao-manager\taotao-manage-web\target\classes\spring\applicationContext-dao.xml]: Cannot resolve reference to bean 'classpath:mybatis/SqlMapConfig.xml' while setting bean property 'configLocation'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'classpath:mybatis/SqlMapConfig.xml' is defined

改为：

7：Eclipse运行项目时巨慢老卡
将Eclipse的配置文件eclipse.ini修改参数为2048m

8:
找不到mapper映射文件

或者

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.taotao.mapper.TbItemMapper.selectByPrimaryKey

使用mybatis逆向工程生成的mapper.xml文件没有进入war包中

修改：
在taotao-manage-mapper 的pom文件中配置，使得自动将mapper.xml文件放入war包中

<build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

9:Controller类可以声明为private 吗

可以，不会影响程序运行结果

10：jsp页面中的方法无法进行跳转

 if(pid!=undefined && pid!="" && pid!="null"){
                 var postData = {
                    pid:pid, pname: encodeURI(MainTitle), ptid: typeId, plid: tags.join(','), pimg: encodeURI(SmallImgPath), poldprice: txtOldPrice, 
                    pnowprice: txtPrice, psort: txtWeight, isStock: IsStock, stock: txtStock, rare: txtFare, pbcount: txtBrowseCount, issellwell: IsSellWell, isrecommend: IsRecommend, isnew: IsNew, pdetail: encodeURIComponent(NewsDetail)
                };
            } else {

                     pname: encodeURI(MainTitle), ptid: typeId, plid: tags.join(','), pimg: encodeURI(SmallImgPath), poldprice: txtOldPrice, pnowprice: txtPrice, 
                     psort: txtWeight, isStock: IsStock, stock: txtStock, rare: txtFare, pbcount: txtBrowseCount, issellwell: IsSellWell, isrecommend: IsRecommend, isnew: IsNew, pdetail: encodeURIComponent(NewsDetail)

            }

else中的数据格式不对

else {
                 var postData = {
                     pname: encodeURI(MainTitle), ptid: typeId, plid: tags.join(','), pimg: encodeURI(SmallImgPath), poldprice: txtOldPrice, pnowprice: txtPrice, 
                     psort: txtWeight, isStock: IsStock, stock: txtStock, rare: txtFare, pbcount: txtBrowseCount, issellwell: IsSellWell, isrecommend: IsRecommend, isnew: IsNew, pdetail: encodeURIComponent(NewsDetail)
                  }
            }

11:js无法跨域访问出现的问题

12:无法找到页面404错误，需要在url中加入项目名或者../

13：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'productController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.honszeal.project.zcld_hxzs.service.ProductService com.honszeal.project.zcld_hxzs.controller.ProductController.productService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'productServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.honszeal.project.zcld_hxzs.dao.ProductDao com.honszeal.project.zcld_hxzs.service.impl.ProductServiceImpl.productDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.honszeal.project.zcld_hxzs.dao.ProductDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

错误代码块：

package com.honszeal.project.zcld_hxzs.dao;

public class ProductDao {

}

原因：ProductDao 应该是一个接口而不能是类

package com.honszeal.project.zcld_hxzs.dao;

public interface ProductDao {

}


13：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘indexController’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.taotao.portal.service.ContentService com.taotao.portal.controller.IndexController.contentService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.taotao.portal.service.ContentService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

分析：可能配置文件出错
配置文件：
<!-- 扫描包，加载service实现类 -->
    <context:component-scan base-package="com.taotao.portal.service"></context:component-scan>
将其改为com.taotao.portal.serviceImpl就好了

分析原因：

如上如果配置文件中写com.taotao.portal.service实无法加载com.taotao.portal.serviceImpl下面的类的
所以修改如下
配置文件

<!-- 扫描包，加载service实现类 -->
    <context:component-scan base-package="com.taotao.portal.service"></context:component-scan>

包路径

13:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'searchServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.taotao.search.dao.SearchDao com.taotao.search.service.impl.SearchServiceImpl.searchDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.taotao.search.dao.SearchDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

包没有扫描上
错误代码块

<!-- 扫描包，加载service实现类 -->
    <context:component-scan base-package="com.taotao.search.service"></context:component-scan>

改正：
不扫描controller的原因是父子容器的问题
<!-- 扫描包，加载service实现类 -->
    <context:component-scan base-package="com.taotao.search">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>


**@Repository**
public class SearchDaoImpl implements SearchDao {

    @Autowired
    private SolrServer solrServer;

14:

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.honszeal.project.zcld_hxzs.dao.ProductDao.showChildType'.  It's likely that neither a Result Type nor a Result Map was specified.

错误代码块

<!-- 子级商品分类修改回显-->
    <select id="showChildType" parameterType="ProductType" >
        SELECT tt.*,
        (SELECT tt1.GoodsTypeName FROM tb_e_g_goods_type tt1 WHERE tt1.goodsTypeId = tt.FGTID) AS parentTypeName 
        FROM tb_e_g_goods_type tt WHERE tt.GoodsTypeID=#{goodsTypeID};
    </select>

这是一个select但是没有返回值

改正：

<!-- 子级商品分类修改回显-->
    <select id="showChildType" parameterType="ProductType" resultType="ProductType" >
        SELECT tt.*,
        (SELECT tt1.GoodsTypeName FROM tb_e_g_goods_type tt1 WHERE tt1.goodsTypeId = tt.FGTID) AS parentTypeName 
        FROM tb_e_g_goods_type tt WHERE tt.GoodsTypeID=#{goodsTypeID};
    </select>

15：参数传递问题

 <table class="easyui-datagrid" id="contentList" data-options="toolbar:contentListToolbar,singleSelect:false,collapsible:true,pagination:true,method:'get',pageSize:20,url:'/content/query/list',queryParams:{categoryId:0}">

此时

/**
     * 查询内容列表并分页
     */
    @RequestMapping("/query/list")
    @ResponseBody
    public EUDataGridResult categoryList(Integer page,Integer rows,Long queryParams){
        EUDataGridResult result = contentService.categoryList(page,rows,queryParams);
        return result;
    }

参数传递错误，类似于js中的这个代码块

 var pram = {
        type: 'GetImgChange',
        pageIndex: PageIndex,
        Likethis: likethis
    };

此时后台controller的参数应该是type，pageIndex，Likethis而不是pram
故修改为

/**
     * 查询内容列表并分页
     */
    @RequestMapping("/query/list")
    @ResponseBody
    public EUDataGridResult categoryList(Integer page,Integer rows,Long categoryId){
        EUDataGridResult result = contentService.categoryList(page,rows,categoryId);
        return result;
    }

16：406错误

/**
     * 测试post请求
     */
    @RequestMapping(value="/httpclient/post",method=RequestMethod.POST)
    @ResponseBody
    public TaotaoResult testPost(String username,String password){
        String result =  "username:"+username+",password:"+password;
        System.out.println(result);
        return TaotaoResult.ok();
    }

@Test
    public void doPost() throws Exception{
        //创建一个httpclient对象，相当于一个浏览器
        CloseableHttpClient httpClient = HttpClients.createDefault();
        //创建一个post对象,*.html才会被拦截
        HttpPost post = new HttpPost("http://localhost:8082/httpclient/post.html");
        //执行post请求
        CloseableHttpResponse response = httpClient.execute(post);
        String string = EntityUtils.toString(response.getEntity());
        System.out.println(string);
        response.close();
        httpClient.close();

    }

<html><head><title>Apache Tomcat/7.0.47 - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 406 - </h1><HR size="1" noshade="noshade"><p><b>type</b> Status report</p><p><b>message</b> <u></u></p><p><b>description</b> <u>The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers.</u></p><HR size="1" noshade="noshade"><h3>Apache Tomcat/7.0.47</h3></body></html>

查看jackson包是否存在
如果存在看后缀是否是html，如果是html是不能响应json数据的，需要修改后缀名
在web-xml配置文件中添加

17:post提交乱码

/**
     * 测试post请求
     */
    @RequestMapping(value="/httpclient/post",method=RequestMethod.POST)
    @ResponseBody
    public String testPost(String username,String password){
        return "username:"+username+",password:"+password;
    }

@Test
    public void doPostWithParam() throws Exception{
        //创建一个httpclient对象，相当于一个浏览器
        CloseableHttpClient httpClient = HttpClients.createDefault();
        //创建一个post对象,*.html才会被拦截
        HttpPost post = new HttpPost("http://localhost:8082/httpclient/post.html");
        //创建一个Entity，模拟一个表单
        List<NameValuePair> kvlist = new ArrayList<>();
        kvlist.add(new BasicNameValuePair("username", "张三"));
        kvlist.add(new BasicNameValuePair("password", "123"));
        //包装成一个Entity对象
        StringEntity entity = new UrlEncodedFormEntity(kvlist, "utf-8");
        //设置请求的内容
        post.setEntity(entity);
        //执行post请求
        CloseableHttpResponse response = httpClient.execute(post);
        String string = EntityUtils.toString(response.getEntity());
        System.out.println(string);
        response.close();
        httpClient.close();

    }

但是portal控制台不是乱码，即控制台提交的时候,服务端接收的时候并没有乱码，是响应给客户端的时候显示乱码，响应乱码，在controller中添加,produces=MediaType.TEXT_PLAIN_VALUE+”;charset=utf-8”)，并且使用.action后缀，否则会406

修改：

/**
     * 测试post请求
     */
    @RequestMapping(value="/httpclient/post",method=RequestMethod.POST,produces=MediaType.TEXT_PLAIN_VALUE+";charset=utf-8")
    @ResponseBody
    public String testPost(String username,String password){
        return "username:"+username+",password:"+password;
    }

运行结果展示：

18：
错误提示

org.springframework.beans.factory.BeanDefinitionStoreException: Could not resolve bean definition resource pattern [classpath:spring/applicationContext*.xml]; nested exception is java.io.FileNotFoundException: class path resource [spring/] cannot be resolved to URL because it does not exist

没有将配置文件加载到class下

原因展示
这段代码本意是想让XXXMapper.xml文件也加载到classes文件下，但是只加载了src/main/java下的

<resource>
   <directory>src/main/java</directory>
    <includes>
        <include>**/*.properties</include>
        <include>**/*.xml</include>
    </includes>
    <filtering>false</filtering>
</resource>

修改

 <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>

编译成功之后展示

19：

org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: ERROR: [doc=536563] Error adding field 'item_price'='2.99E7' msg=For input string: "2.99E7"
    at org.apache.solr.client.solrj.impl.HttpSolrServer.executeMethod(HttpSolrServer.java:552)

原因分析


改正：

//商品价格
    private long price;

20:

java.lang.IllegalStateException: Optional int parameter 'page' is present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.

public String search(@RequestParam(value="q",defaultValue="手机")String queryString,int page,Model model){
        SearchResult searchResult = searchService.search(queryString, page);

改正:

public String search(@RequestParam(value="q",defaultValue="手机")String queryString,Integer page,Model model){
        SearchResult searchResult = searchService.search(queryString, page);

21:空指针异常

@RequestMapping("/search")
    public String search(@RequestParam(value="q",defaultValue="手机")String queryString,Integer page,Model model){
        SearchResult searchResult = searchService.search(queryString, page);
        //向页面传递参数

此时page刚开始为空，为null，下面是serviceImpl代码

public interface SearchService {

    SearchResult search(String queryString,int page);

}

将null赋值给int类型，报错

改正：

public String search(@RequestParam(value="q",defaultValue="手机")String queryString,
            @RequestParam(defaultValue="1")Integer page,Model model){