最近公司比較忙，好久沒寫文章了，今天來一篇。

要生成的目標java檔案

package com.cs.qdog.swift.objects;  
  
public class F32B {  
  
    private Double amount;  
    private String currency;  
  
    public Double getAmount() {  
        return amount;  
    }  
  
    public void setAmount(Double amount) {  
        this.amount = amount;  
    }  
  
    public String getCurrency() {  
        return currency;  
    }  
  
    public void setCurrency(String currency) {  
        this.currency = currency;  
    }  
}  
 

模板檔案SwiftFieldClass.txt（可以是任意格式的檔案）

package com.cs.qdog.swift.objects;  
  
public class ${class} {  
  
  <#list properties as prop>  
    private ${prop.type} ${prop.name};  
  </#list>  
  
  <#list properties as prop>  
    public ${prop.type} get${prop.name?cap_first}(){  
      return ${prop.name};  
    }  
    public void set${prop.name?cap_first}(${prop.type} ${prop.name}){  
      this.${prop.name} = ${prop.name};  
    }  
  </#list>  
  
  
}  
 
 

    package com.cs.qdog.swift.objects;  
      
    import java.io.File;  
    import java.io.IOException;  
    import java.io.OutputStreamWriter;  
    import java.io.Writer;  
    import java.util.Collection;  
    import java.util.HashMap;  
    import java.util.HashSet;  
    import java.util.Map;  
      
    import freemarker.template.Configuration;  
    import freemarker.template.DefaultObjectWrapper;  
    import freemarker.template.Template;  
    import freemarker.template.TemplateException;  
      
    public class GenObjects {  
      
        public static void main(String[] args) throws IOException,  
                TemplateException {  
      
            /* ------------------------------------------------------------------- */  
            /* You usually do it only once in the whole application life-cycle: */  
      
            /* Create and adjust the configuration */  
            Configuration cfg = new Configuration();  
            cfg.setDirectoryForTemplateLoading(new File(  
                    "D:/Temp/EclipseWorkSpace/GenSwiftFields/templates"));  //模板父路徑
            cfg.setObjectWrapper(new DefaultObjectWrapper());  
      
            /* ------------------------------------------------------------------- */  
            /* You usually do these for many times in the application life-cycle: */  
      
            /* Get or create a template */  
            Template temp = cfg.getTemplate("SwiftFieldClass.");  //模板檔案，相對於setDirectoryForTemplateLoading設定的路徑
      
            /* Create a data-model */  
            Map<String, Object> root = new HashMap<String, Object>();  //注意必須有一個根結點 data-model
            root.put("class", "F32B");  
            Collection<Map<String, String>> properties = new HashSet<Map<String, String>>();  
            root.put("properties", properties);  
      
            /* subfield 1: currency */  
            Map<String, String> currency = new HashMap<String, String>();  
            currency.put("name", "currency");  
            currency.put("type", "String");  
            properties.add(currency);  
      
            /* subfield 2: amount */  
            Map<String, String> amount = new HashMap<String, String>();  
            amount.put("name", "amount");  
            amount.put("type", "Double");  
            properties.add(amount);  
      
            /* Merge data-model with template */  
            String targetPath="***";//生成的目標檔案的父目錄
            String targetFile="****";//生成目標檔案的名字
            if (!targetPath.exists())
                targetPath.mkdirs();
             File targetFile = new File(targetBasePath,targetFileName);
                if (!targetFile.exists())
                    targetFile.createNewFile();
            Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(targetFile), "UTF-8"));  
            temp.process(root, out);  
            out.flush();  
        }  
      
    }