Fatal编程技术网
  • java/
  • Java 带有自动连线语句的NullPointerException

Java 带有自动连线语句的NullPointerException

java spring

Java 带有自动连线语句的NullPointerException,java,spring,nullpointerexception,autowired,Java,Spring,Nullpointerexception,Autowired,这是我的方法： @Autowired private HeadHunterService headHunterService; public String getBarChartUrlByLang(String pl) { List<HeadHunter> headHunter = headHunterService.getLastDataByLang(pl); List<String> city = new ArrayL

这是我的方法：

@Autowired
    private HeadHunterService headHunterService;

    public String getBarChartUrlByLang(String pl) {
        List<HeadHunter> headHunter = headHunterService.getLastDataByLang(pl);
        List<String> city = new ArrayList<String>();
        List<Integer> salaries = new ArrayList<Integer>();
        for (int i = 0; i < headHunter.size(); i++) {
            city.add(headHunter.get(i).getCity().toString());
            salaries.add(headHunter.get(i).getSalary().intValue());
        }
        final int MAX_SALARY = headHunter.get(0).getSalary();
        Data salaryData = DataUtil.scaleWithinRange(0, MAX_SALARY, salaries);
        BarChartPlot salary = Plots.newBarChartPlot(salaryData,
                Color.newColor("3298C9"));
        BarChart chart = GCharts.newBarChart(salary);

        // Defining axis info and styles
        AxisStyle axisStyle = AxisStyle.newAxisStyle(Color.newColor("000000"),
                9, AxisTextAlignment.CENTER);

        AxisLabels cities = AxisLabelsFactory.newAxisLabels(city);
        cities.setAxisStyle(axisStyle);

        AxisLabels salaryCount = AxisLabelsFactory.newNumericRangeAxisLabels(0,
                MAX_SALARY);
        salaryCount.setAxisStyle(axisStyle);

        // Adding axis info to chart.
        chart.addXAxisLabels(cities);
        chart.addYAxisLabels(salaryCount);
        chart.setHorizontal(false);
        chart.setSize(800, 300);
        chart.setSpaceBetweenGroupsOfBars(54);

        // /51 is the max number of medals.
        chart.setGrid(10, 800, 3, 2);
        chart.setBackgroundFill(Fills.newSolidFill(Color.newColor("FFFFFF")));
        String url = chart.toURLString();

        return url;
    }
第47行是：
System.out.println（googleCharts.getbarcharturlbylbylang（“Java”）

这是我的根上下文：


<context:annotation-config />


    <context:component-scan base-package="net.babobka.blog" />
    <mvc:resources mapping="/resources/**" location="/resources/" />
    <cache:annotation-driven />

    <bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
        <property name="caches">
            <set>
                <bean
                    class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean"
                    p:name="template" />
                <bean
                    class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean"
                    p:name="headHunter" />

            </set>
        </property>
    </bean>

    <bean id="converter" class="net.babobka.blog.headHunter.Converter" />

    <bean id="googleCharts" class="net.babobka.blog.charts.GoogleCharts" />


    <bean id="propertyConfigurer"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
        p:location="/WEB-INF/db/jdbc.properties" />

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close" p:driverClassName="${jdbc.driverClassName}"
        p:url="${jdbc.databaseurl}" p:username="${jdbc.username}" p:password="${jdbc.password}" />
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation">
            <value>/WEB-INF/db/hibernate.cfg.xml</value>
        </property>
        <property name="configurationClass">
            <value>org.hibernate.cfg.AnnotationConfiguration</value>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${jdbc.dialect}</prop>
                <prop key="hibernate.show_sql">${jdbc.show_sql}</prop>
                <prop key="hibernate.connection.useUnicode">true</prop>
                <prop key="hibernate.connection.characterEncoding">UTF-8</prop>
                <prop key="hibernate.connection.charSet">UTF-8</prop>
            </props>
        </property>
    </bean>




    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
    <mvc:annotation-driven />
    <tx:annotation-driven />
    <task:annotation-driven />



    <bean id="Backupper" class="net.babobka.blog.backupper.Backupper"></bean>

    <bean id="OldDataRemoval" class="net.babobka.blog.termination.OldDataRemoval"></bean>

    <bean id="HeadHunterImport" class="net.babobka.blog.headHunter.HeadHunterImport"></bean>



    <bean id="urlForwardController"
        class="org.springframework.web.servlet.mvc.UrlFilenameViewController" />

    <bean id="tilesConfigurer"
        class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
        <property name="definitions">
            <list>
                <value>/WEB-INF/tiles.xml</value>
            </list>
        </property>
    </bean>

    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.tiles2.TilesView" />
    </bean>

    <bean id="viewResolver1"
        class="org.springframework.web.servlet.view.ResourceBundleViewResolver">
        <property name="order" value="1" />
        <property name="basename" value="views" />
    </bean>




/WEB-INF/db/hibernate.cfg.xml
org.hibernate.cfg.AnnotationConfiguration
${jdbc.dial}
${jdbc.show_sql}
真的
UTF-8
UTF-8
/WEB-INF/tiles.xml


和PDFBuilder（我认为这没有帮助）：


公共类PDFBuilder扩展AbstractITextPdfView{
@自动连线
私人谷歌图表；
@凌驾
受保护的void buildPDF文档（地图模型、文档文档、，
PdfWriter编写器，HttpServletRequest请求，
HttpServletResponse）引发异常{
//获取Spring容器传递的数据模型
列表猎头=（列表）模型
.get（“列表猎头”）；
文件添加（新段落（“最后数据”
+get（0.getPl（）.toString（））；
System.out.println（googleCharts.getbarcharturlbylbylang（“C++”）；
字符串imageUrl=”http://chart.apis.google.com/chart?cht=bvg&chxt=y，x&chco=3298C9&chs=800x300&chbh=23,4,54&chf=bg，s，FFFFFF&chg=10.0800.0,3,2&chxr=0,0.091557.0&chd=e:…0WX1T6TBPCKHJOI4&chxs=0000000,9,0&chxl=1:|莫斯科|圣彼得堡|沃罗涅日|尼日|诺夫哥罗德|托木斯克|新西伯利亚|卡捷琳顿|；
PdfPTable=新的PdfPTable（3）；
表3.设置宽度百分比（100.0f）；
表.设置宽度（新浮点[]{3.0f，2.0f，2.0f}）；
表10.之前的设置间隔（10）；
//定义表格标题行的字体
Font=FontFactory.getFont（FontFactory.HELVETICA）；
font.setColor（BaseColor.WHITE）；
//定义表格标题单元格
PdfPCell cell=新的PdfPCell（）；
基色颜色=新基色（50152186）；
cell.setBackgroundColor（颜色）；
细胞组（10）；
//写表头
setPhrase（新短语（“城市”，字体））；
表2.addCell（cell）；
cell.setPhrase（新短语（“空缺”，字体））；
表2.addCell（cell）；
cell.setPhrase（新短语（“平均工资”，字体））；
表2.addCell（cell）；
//写入表行数据
针对（猎头hh:listHeadHunter）{
table.addCell（hh.getCity（））；
table.addCell（hh.getUnderations（）.toString（））；
table.addCell（hh.getSalary（）.toString（））；
}
单据新增（表）；
添加文件（新段落（“\n视觉表示（薪资/城市）”）；
Image=Image.getInstance（新URL（imageUrl））；
图像。设置绝对位置（35f、335f）；
可缩放溶质（540f，203f）；
文档添加（图像）；
}
}



怎么了？
PdfBuilder
不是spring管理的bean，因此没有任何
@Autowired
可以工作。将其设置为bean或使用
@Configurable


更多关于自动布线的阅读：（参见§5.4.5），
在此类上添加getter和sester方法


public void setGoogleCharts(GoogleCharts googleChatrs) {
      this.googleChats = googleChats
}

public GoogleCharts getGoogleCharts() {
       return googleChatrs;
}



显然有些东西没有正确地自动连线。向我们显示您的上下文配置和
@Autowired
声明。配置文件已添加到主题中。这是声明：
@Autowired private GoogleCharts GoogleCharts
是在
组件扫描
包？post
PdfBuilder
代码中具有
@自动连线
的类。它位于
net.blog.babobka.pdf
我不知道我没有代码。。没有魔法，如果你想让自动连线工作，包含
@Autowired
的类必须是一个bean（或
@Configurable
）哦。我明白了
位于net.babobka.blog.pdf.AbstractITextPdfView.RenderMergeDoutModel（AbstractITextPdfView.java:47）org.springframework.web.servlet.view.AbstractView.render（AbstractView.java:262）
。

<context:annotation-config />


    <context:component-scan base-package="net.babobka.blog" />
    <mvc:resources mapping="/resources/**" location="/resources/" />
    <cache:annotation-driven />

    <bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
        <property name="caches">
            <set>
                <bean
                    class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean"
                    p:name="template" />
                <bean
                    class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean"
                    p:name="headHunter" />

            </set>
        </property>
    </bean>

    <bean id="converter" class="net.babobka.blog.headHunter.Converter" />

    <bean id="googleCharts" class="net.babobka.blog.charts.GoogleCharts" />


    <bean id="propertyConfigurer"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
        p:location="/WEB-INF/db/jdbc.properties" />

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close" p:driverClassName="${jdbc.driverClassName}"
        p:url="${jdbc.databaseurl}" p:username="${jdbc.username}" p:password="${jdbc.password}" />
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation">
            <value>/WEB-INF/db/hibernate.cfg.xml</value>
        </property>
        <property name="configurationClass">
            <value>org.hibernate.cfg.AnnotationConfiguration</value>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${jdbc.dialect}</prop>
                <prop key="hibernate.show_sql">${jdbc.show_sql}</prop>
                <prop key="hibernate.connection.useUnicode">true</prop>
                <prop key="hibernate.connection.characterEncoding">UTF-8</prop>
                <prop key="hibernate.connection.charSet">UTF-8</prop>
            </props>
        </property>
    </bean>




    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
    <mvc:annotation-driven />
    <tx:annotation-driven />
    <task:annotation-driven />



    <bean id="Backupper" class="net.babobka.blog.backupper.Backupper"></bean>

    <bean id="OldDataRemoval" class="net.babobka.blog.termination.OldDataRemoval"></bean>

    <bean id="HeadHunterImport" class="net.babobka.blog.headHunter.HeadHunterImport"></bean>



    <bean id="urlForwardController"
        class="org.springframework.web.servlet.mvc.UrlFilenameViewController" />

    <bean id="tilesConfigurer"
        class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
        <property name="definitions">
            <list>
                <value>/WEB-INF/tiles.xml</value>
            </list>
        </property>
    </bean>

    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.tiles2.TilesView" />
    </bean>

    <bean id="viewResolver1"
        class="org.springframework.web.servlet.view.ResourceBundleViewResolver">
        <property name="order" value="1" />
        <property name="basename" value="views" />
    </bean>



public class PDFBuilder extends AbstractITextPdfView {

    @Autowired
    private GoogleCharts googleCharts;

    @Override
    protected void buildPdfDocument(Map<String, Object> model, Document doc,
            PdfWriter writer, HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        // get data model which is passed by the Spring container

        List<HeadHunter> listHeadHunter = (List<HeadHunter>) model
                .get("listHeadHunter");
        doc.add(new Paragraph("Last data for "
                + listHeadHunter.get(0).getPl().toString()));
        System.out.println(googleCharts.getBarChartUrlByLang("C++"));
        String imageUrl = "http://chart.apis.google.com/chart?cht=bvg&chxt=y,x&chco=3298C9&chs=800x300&chbh=23,4,54&chf=bg,s,FFFFFF&chg=10.0,800.0,3,2&chxr=0,0.0,91557.0&chd=e:..0wx1t6tbrBpCkhjOi4&chxs=0,000000,9,0|1,000000,9,0&chxl=1:|Moscow|Saint+Petersburg|Voronezh|Nizhny+Novgorod|Tomsk|Novosibirsk|Yekaterinburg|Samara|Kazan|Rostov-on-Don";

        PdfPTable table = new PdfPTable(3);
        table.setWidthPercentage(100.0f);
        table.setWidths(new float[] { 3.0f, 2.0f, 2.0f });
        table.setSpacingBefore(10);

        // define font for table header row
        Font font = FontFactory.getFont(FontFactory.HELVETICA);
        font.setColor(BaseColor.WHITE);

        // define table header cell
        PdfPCell cell = new PdfPCell();
        BaseColor color = new BaseColor(50, 152, 186);
        cell.setBackgroundColor(color);
        cell.setPadding(10);

        // write table header
        cell.setPhrase(new Phrase("City", font));
        table.addCell(cell);

        cell.setPhrase(new Phrase("Vacancies", font));
        table.addCell(cell);

        cell.setPhrase(new Phrase("Avg. salary", font));
        table.addCell(cell);

        // write table row data
        for (HeadHunter hh : listHeadHunter) {
            table.addCell(hh.getCity());
            table.addCell(hh.getVacancies().toString());
            table.addCell(hh.getSalary().toString());

        }

        doc.add(table);
        doc.add(new Paragraph("\n Visual representation (salary/city)"));
        Image image = Image.getInstance(new URL(imageUrl));
        image.setAbsolutePosition(35f, 335f);
        image.scaleAbsolute(540f, 203f);
        doc.add(image);

    }

}



public void setGoogleCharts(GoogleCharts googleChatrs) {
      this.googleChats = googleChats
}

public GoogleCharts getGoogleCharts() {
       return googleChatrs;
}