带有JasperReport库和MongoDB的java GeneratePDF

Question

mongoDB在27017上运行，我的收藏名是test

  try {
            // - Connection to base
            String mongoURI = "mongodb://localhost:27017/test";
            MongoDbConnection connection = null;

        Map<String, Object> parameters = new HashMap<String, Object>();
        try {
line35      connection = new MongoDbConnection(mongoURI, null, null);
                parameters.put(MongoDbDataSource.CONNECTION, connection);
                JasperDesign jasperDesign = JRXmlLoader.load("/home/gocoffee.jrxml");
                JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);
                File jasperFile;
                jasperFile = new File("/home/MongoDbReport.jasper");
                JasperCompileManager.compileReportToFile("/home/gocoffee.jrxml", "MongoDbReport.jasper");
                JasperFillManager.fillReportToFile("/home/MongoDbReport.jasper", parameters);               
                JasperExportManager.exportReportToPdfFile("/home/MongoDbReport.jrprint");
            }

我有这个错误，我不明白为什么：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Logger
    at com.jaspersoft.mongodb.MongoDbConnection.<init>(MongoDbConnection.java:62)
    at Generate.main(Generate.java:35)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)

MongoURI似乎很好，我想我没有任何登录名或密码

Answer 1

我同意@AdamC：你需要log4j。但我想说，这不是“安装”它的问题；你只需要添加一个log4j。jar文件到您的项目类路径。你的代码看起来不错

编辑：将我的评论中的信息移动到答案中

除了添加log4j。jar到类路径，还需要一个名为log4j的文件。属性来配置log4j。您可以创建自己的副本，也可以从jasperforge上的MongoDB连接器源获取副本。查找src/main/resources/log4j。财产