java zip

@RequestMapping(value="/Table/createCode/{tableName}/{tablePrefix}", method=RequestMethod.GET)
    public void createCode(@PathVariable String tableName, @PathVariable String tablePrefix) throws TemplateException, IOException {        
        String tableShortName = tableName.substring(tableName.indexOf(tablePrefix) + tablePrefix.length() + 1);
        
        cfg = new Configuration(Configuration.VERSION_2_3_32);
        ClassTemplateLoader ctl = new ClassTemplateLoader(getClass(), "/templates");
        cfg.setTemplateLoader(ctl);
        cfg.setDefaultEncoding("UTF-8");
        
        
        root = new HashMap<String, Object>();
        
        List<TableEntity> varList = seService.getTableByName(tableName);
        Iterator<TableEntity> itr = varList.iterator();
        while(itr.hasNext())
        {
            TableEntity item = itr.next();
            if(item.getType().equals("bigint"))
                item.setType("Integer");
            else if(item.getType().equals("character varying"))
                item.setType("String");
        }
        root.put("tableNameUpperCamel", CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.UPPER_CAMEL, tableShortName));
        root.put("tableNameLowerCamel", CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, tableShortName));
        root.put("tableName", tableName);
        root.put("tableList", varList);
        
        List<String> fileList = new ArrayList<String>();
        fileList.add("entity");
        fileList.add("controller");
        fileList.add("mapper");
        fileList.add("service");
        
        try {
            response.reset();
            response.setContentType("application/zip;charset=UTF-8");
            response.setHeader("Content-Disposition", "attachment; filename=test.zip");            
            
            ZipOutputStream zip = new ZipOutputStream(response.getOutputStream());
            
            
            for(String file : fileList)
            {
                WriteHttpStream(zip, file, tableShortName);
            }
            
            
            
            zip.close();

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        
        
        
        
        //format return data    
        //return ReturnUtils.CreateReturn(ReturnUtils.CreateReturnData(varList, varList.size()));
    }

private void WriteHttpStream(ZipOutputStream zip, String templateName, String tableName) throws TemplateNotFoundException, MalformedTemplateNameException, ParseException, IOException, TemplateException
    {
        String fileName = tableName + "_" + templateName;
        fileName = CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.UPPER_CAMEL, fileName);
        
        zip.putNextEntry(new ZipEntry(templateName + "/"));
        zip.closeEntry();
        
        zip.putNextEntry(new ZipEntry(templateName + "/" + fileName + ".java"));
        Template temp = cfg.getTemplate(templateName + ".ftl");
        Writer out = new OutputStreamWriter(zip);
        temp.process(root, out);
        zip.flush();
        zip.closeEntry();
        
        if(templateName == "mapper")
        {
            zip.putNextEntry(new ZipEntry(templateName + "/" + fileName + ".xml"));
            temp = cfg.getTemplate(templateName + ".xml.ftl");
            out = new OutputStreamWriter(zip);
            temp.process(root, out);
            zip.flush();
            zip.closeEntry();
        }
        
        if(templateName == "service")
        {
            zip.putNextEntry(new ZipEntry(templateName + "/" + fileName + "Impl.java"));
            temp = cfg.getTemplate(templateName + ".impl.ftl");
            out = new OutputStreamWriter(zip);
            temp.process(root, out);
            zip.flush();
            zip.closeEntry();
        }
        
    }

package com.accel.UamConfig.entity;

import java.util.LinkedList;
import java.util.List;

public class ${tableNameUpperCamel}Entity {    
<#list tableList as item>
<#assign newName>${item.name?replace("_"," ")?capitalize?uncap_first?replace(" ","")}</#assign>
    private ${item.type} ${newName};
</#list>

<#list tableList as item>
<#assign newName>${item.name?replace("_"," ")?capitalize?uncap_first?replace(" ","")}</#assign>
    public ${item.type} get${newName?capitalize}() {
        return ${newName};
    }
    public void set${newName?capitalize}(${item.type} ${newName}) {
        this.${newName} = ${newName};
    }
</#list>
}