Jsf 2 导出ui：将列表重复为CSV文件

我正在使用

显示列表。现在我想将整个列表导出到CSV文件。在JSF2.0中有什么方法可以做到这一点吗？

是的，有一种方法。添加一个显示“导出”的命令按钮

<h:form>
    <h:commandButton value="export" action="#{bean.export}" />
</h:form>

public void export() throws IOException {
    FacesContext fc = FacesContext.getCurrentInstance();
    ExternalContext ec = fc.getExternalContext();
    String filename = "somename.csv";

    ec.responseReset();
    ec.setResponseContentType("text/csv");
    ec.setResponseHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
    Writer writer = ec.getResponseOutputWriter();

    for (Something something : somethings) { // somethings is your List<Something>
        writer.append(toCsvField(something.getFoo()))
              .append(',')
              .append(toCsvField(something.getBar()))
              .append(',');
              .append(toCsvField(something.getBaz()))
              .append('\n');
    }       

    fc.responseComplete(); // Important! Otherwise JSF will perform navigation.
}

public static String toCsvField(Object value) {
    if (value == null) {
        return "";
    }

    String field = String.valueOf(value).replace("\"", "\"\"");

    if (field.indexOf(',') > -1 || field.indexOf('"') > -1) {
        field = '"' + field + '"';
    }

    return field;
}